# Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

91,718 questions, page 802
1. ## physics

"A solid cylinder and a thin-walled hollow cylinder have the same mass and radius. They are rolling horizontally along the ground toward the bottom of an incline. They center of mass of each cylinder has the same translational speed. The cylinders roll up

asked by Seth on April 3, 2011
2. ## physics

"A solid cylinder and a thin-walled hollow cylinder have the same mass and radius. They are rolling horizontally along the ground toward the bottom of an incline. They center of mass of each cylinder has the same translational speed. The cylinders roll up

asked by Seth on April 1, 2011
3. ## Calculus Part 2

y = tan(sqrtx) Find dy/dx. So I found it and I got the answer as sec^2(sqrtx) but the answer is (sec^2(sqrtx))/2(sqrtx)...why? ---------------------------------- 2) Find the line which passes through the point (0, 1/4) and is tangent to the curve y=x^3 at

asked by Samantha on November 4, 2008
4. ## math

The relationship described below can be modeled using an equation. Identify the variables and write an equation to solve the questions below. Number of Credits Fees 3 2000 6 2600 9 3200 12 3800 15 4400 a) Write an equation to calculate the fees F when the

asked by daisy on September 1, 2012
5. ## Math

Circle S and Circle U are congruent circles. The figure shows two circles with their center labeled as Upper S and Upper U. The two circles overlap each other such that they intersect at points Upper R and Upper T. D Name three radii of Circle S. Name

asked by Help on August 8, 2019
6. ## Mathematics

A shop offered a special on socks and handkerchiefs for Father's Day. For k50 you could buy 7 pair of socks and 3 boxes of handkerchiefs or for K24 you could buy 3 pair of socks and 2 boxes of handkerchiefs. A. From a pair of simultaneous equations for the

asked by Monica on June 13, 2016
7. ## physics

A ball is thrown upward off the top of a 30-meter high building. 10 meters below the top of the roof, is the top of a window, which is 2 meters high. How long (time) does it take for the ball to pass from top to bottom of the window? What I have so far is:

asked by Dreskillz89 on September 28, 2009
8. ## Math

1. Based on the given information, what can you conclude, and why? Given: m angle P= m angle T ; PR=TR. A) Triangle QRP is congruent to Triangle TRS by SAS. B) Triangle QRP is congruent to Triangle SRT by SSS. C) Triangle QRP is congruent to Triangle SRT

asked by Tim on February 9, 2016
9. ## Math/Calculus

Solve the initial-value problem. Am I using the wrong value for beta here, 2sqrt(2) or am I making a mistake somewhere else? Thanks. y''+4y'+6y=0, y(0)=2, y'(0)=4 r^2+4r+6=0, r=(-4 +/- sqrt(16-4(1)(6))/2 r=-2 +/- sqrt(2)*i , alpha = -2, beta = 2(sqrt(2))

asked by COFFEE on July 12, 2007
10. ## math

A triangle has a height of x meters and a base of 14 meters. Write and solve an inequality for the values of x that give an area of at most 112 m2003-06-04-00-00_files/i0230000.jpg. A. 2003-06-04-00-00_files/i0230001.jpg m B.

asked by marquez on June 19, 2014
11. ## english

These questions are from The cask of Amontillado by Edgar Allan Poe 1. Is there really a cask of amontillado? how do you know? 2. Montresor seems to try to discourage Fortunato from coming along with him to the catacombs. Why does Montresor urge Fortunato

asked by Anonymous on September 18, 2014
12. ## math

Resolved QuestionShow me another » AP Calculus related rates problem? The volume V or a cone (V = 1/3 ð r² h) is increasing at a rate of 28ð cubic units per second. At the instant when the radius r of the cone is 3 units, its volume is 12ð cubic units

asked by kelli on December 19, 2009
13. ## english grammar

I have learning about the communication process that a correct interpretation in the communication process is necessary for an effective way of communication between sender and receiver. Make mistakes in interpretation can cause misunderstanding between

asked by natty 3 on December 20, 2011
14. ## Law

I have to find key political words for this newspaper article so please check whehter the words i listed is right in the bottom and if there is anything i should add: Government contributes \$9m for soldier protection Published on Tue, 14/06/2011, 11:45:04

asked by Crissy XD on July 6, 2011
15. ## Math

Write an equation of the line satisfying the given condition. a) x intercept = 3 y intercept=-2 I am really not sure how to start here. b) vertical line containing (5,-1) Would it be y=5x-1? c) parallel to the line 3x-4y=5 and containing the points (3,-6)

asked by Hannah on October 5, 2010
16. ## math

on the way to the Open Air Museum Jaz and Kim stop to buy petrol.The petrol costs \$3.15 for one USE gallon. Kim wants to compare the cost of petrol in America with the cost of petrol in England. Kim uses this information - 1 US gallon=3.875 litres - 1

asked by Anonymous on October 3, 2016
17. ## Check them please MAth

1. Write the following ratio in simplest form: 32 min:36 min (1 point) 8:98:3632:9128:144 2. Marie saved \$51. On Wednesday, she spent \$8 of her savings. What ratio represents the portion of her total savings that she still has left? (1 point)

asked by Dipper Pines on December 2, 2016
18. ## World history; Check:P

Human Origins Essay Write a opinion paper on the most significant consequences of the Agricultural Revolution. One of the greatest consequence was that the population increased. The increase of population lead to the need of more clothing. People who were

asked by Unknown on February 15, 2013
19. ## English

i writing a process analysis essay on topic staying healthy in winter and i making it a directional type of process analysis essay because it be easy to direct people on how to do things. the only points i get for staying healthy in winter be wearing warm

asked by Mohammad on April 11, 2012
20. ## math

Mr. Tip is working on the marching band's halftime show. During the first song, rows have 9 musicians each. During the second song, rows change to contain 6 musicians each. If there are a total of 252 musicians in the marching band, how many rows will

asked by Anonymous on March 12, 2012
21. ## trig

Third time is the charm? I'll try again. Could someone show me how, (- sin (x/2) /( 2 sin (x/2) + cos (x/2)) is an alternate representation for, 1 / ( 4 tan (x/2) + 2 ) TIA Carol This doesn't require the solving of any equations. For example, ( same

asked by Carol on January 3, 2011
22. ## English

I need some help diagraming the sentence: How can an art decay? Thanks, Michelle art | can decay ________________ \ \ \an \ How \ \ Please note in the above diagram that "How" modifies "can decay." i need help distinguishing verbs from verbals (cont.) i

asked by Michelle on June 15, 2005
23. ## college-speech

care to edit my entertainment speech? make it funny..please Heroes. We all have them. At least we're SUPPOSED to all have them... So you can imagine my disappointment when I realized that I didn't have a hero. I had to find one. U2? There's too many of

asked by meimei on March 14, 2009
24. ## can someone help me with a question of an explanat

my question is for math, I have the problem worked out i just don't remember what the tutor who helped me told me for the explanation of steps i just like to know how they came up with that. Directions: Solve each literal equation for the indicated

asked by jasmine20 on January 3, 2007
25. ## stats

use dependent samples t test. Set hypothesis so what formula will I use to solve Five people who were convicted of speeding were ordered by the court to attend a workshop. A special device put into their cars kept records of their speeds for two weeks

asked by Anonymous on March 13, 2013
26. ## Trig

When the angle of elevation of the sun is 61°​, a telephone pole that is tilted at an angle of 8° directly away from the sun casts a shadow 20 feet long. Determine the length of the pole to the nearest foot. I'm stuck halfway through this problem, I

asked by Seth on March 5, 2017
27. ## Algebra

13. Which relationship would most likely have a positive correlation? a. The amount of memory in a computer, and the number of keys on the keyboard. b. The rate at which a train travels, and the time it takes for it to reach its destination. c. The number

asked by mysterychicken on May 14, 2010
28. ## Engineering Economy

The football coach at the Midwestern university was given a 5yr employment contract that paid \$22500 the first year and increased at an 8% uniform rate in each subsequent year. At the end of the first year's football season, the alumni agreed to buy his

asked by John on September 24, 2007
29. ## CHEM

My balanced equation is: a) 2C8H18(g) + 25O2(g) -> 16CO2(g) + 18H2O(g) b) 0.290 mol of octane is allowed to react with 0.670mol of oxygen. Which is the limiting reactant? (((Which I found Oxygen to be the limiting reactant.))) I do not understant how to

asked by K on October 15, 2007
30. ## Calculus (area of base and volume of solid)

Can you check my work and see if I did the problem correctly? Thanks! A solid with a base formed by intersecting sine and cosine curves and built up with semi-circular cross-sections perpendicular to the x-axis. Find the area of the base and the volume of

asked by Anonymous on May 22, 2008
31. ## Math

How could Jason solve for T in this equation? T - 8 = 40 A) add 8 to the left side B) add 8 to the left side and subtract 8 from the right side C) add 8 to each side D) divide each side by 8

asked by David on November 12, 2016
32. ## accounting

Plumley Ad Agency contracted with a company to prepare an ad campaign. Plumley uses a job order costing system. Plumley estimates that the job will take 145 designer hours at \$90 per hour and 85 staff hours at \$45 per hour. Plumley uses two overhead rates

asked by Anonymous on December 10, 2011
33. ## Statistics

In a game of dice, the probability of rolling a 12 is 1/36. The probability of rolling a 9, 10, or 11 is 9/36. The probability of rolling any other number is 26/36. If the player rolls a 12, the player wins \$5. If the player rolls a 9, 10, or 11, the

asked by tamar on November 17, 2017
34. ## AP Chemistry

DrBob222 thank you for your previous response. I am reposting the entire question. Two different 1.2 L buffered solutions were prepared using HOBr and LiOBr. Both buffered solutions had a pH of 5.2 at 25C. After 0.17 mols of HI were added to each of the

asked by KorieBird on March 13, 2018
35. ## US History

14. New France was shaped mainly by a. raising cash crops b. the fur trade c. enslaving Native Americans d. the search for gold B? 15. Which one of the following helped the colonial legislatures come to dominate colonial government? a. The king appointed

asked by mysterychicken on September 29, 2010
36. ## English - ms. sue

Ms. sue for the persasive essay on glass castle, you tell me to give examples in essay to prove thesis which be that her father be better parent. The teacher say there have to be 4 bodies. So the first one be introduction, second one and third one be

asked by Mohammad on April 27, 2012
37. ## Dynamics of Machinary

Write a matlab code for a hoekens linkage that will draw a 15 cm straight line. clear % clears all variables from the workspace clc % clears the command window and homes the cursor close all % closes all the open figure windows L0 = 7.5; L1 = 3.75; L2 =

asked by Wang on November 20, 2016
38. ## Math

I have a practice question that I am stuck on and need help. A certain insect pest has infested a cornfield. The pests are spreading through the field in a circular pattern at the rate of 3m/day. When the radius of the infested area is 70m. How fast is the

asked by Dave on December 3, 2006
39. ## Physics

A meteor streaking through the night sky is located with radar. At point A its coordinates are (5.20km,1.20km), and 1.16s later its has moved to point B with coordinates (6.08km, 0.900km ). a) find the x comonent of it average velocity between A and B.

asked by Amy on January 22, 2012
40. ## physics

Hi! I have a problem for physics homework and I though I knew how to solve it but apparently it is wrong, please help! 'Two cars, one of mass 1000 kg, and the second of mass 2400 kg, are moving at right angles to each other when they collide and stick

asked by Ty on December 13, 2007
41. ## Science

I need some help with this question from a science quiz. Using an example, explain how being able to understand scientific principles and think scientifically can help you solve problems and answer questions in your everyday life. An experiment that uses

asked by M on October 1, 2018
42. ## chemistry

how do I solve for: How many grams of water would be lost form 100.0grams of CuCl2 x 5H2O when the hydrated salt was heated at 1000degreesC for one hour in a crucible? What is the percent composition of water in the compound: Percentwater= 5*(2+16)/(5*18 +

asked by digits on November 17, 2006
43. ## Science

a truck is carrying a 2800 kg crate of heavy machinery. if the coefficient of static friction between the crate and the bed of the truck is 0.55, what is the maximum rate the driver can decelerate when coming to a stop in order to avoid crushing the cab

asked by tiarra on December 29, 2006
44. ## Physics URGENT!!!

A sled loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 40.0o above the horizontal. The sledge moves a distance of 16.0 m on a horizontal surface. The coefficient of kinetic friction between the sledge

asked by Anonymous on October 8, 2012
45. ## Physics URGENT!!!

A sled loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 40.0o above the horizontal. The sledge moves a distance of 16.0 m on a horizontal surface. The coefficient of kinetic friction between the sledge

asked by Megan on October 5, 2012
46. ## Physics

Starting from rest, a horse pull a 250-kg cart for a distance of 1,5km. it reaches a speed of 0,38m/s by the time it has walked 50,0m and then walks at constant speed.fictional force 260n.each gram of oats the horse eats releases 9kJ of energy. 10% of this

asked by Marina on May 8, 2014
47. ## Physics

A 5 kg mass is thrown up with a velocity of 4 m/s from a height of 30 m onto a spring with a relaxed length of 10 m, and a constant of 400 N/m. What will the maximum compression of the spring be? What will the speed of the object be when the spring is

asked by Bartholomew on January 15, 2009
48. ## algebra

A principal of \$5000 was invested in a savings account for 4 years. If the interest earned for the period was \$400, what was the interest rate? i know this is 1.5 % or at least I think it is but how do i write it out? Use the equation I=Prt, where

asked by confused on May 30, 2007
49. ## Physics- Elena please help!

A sled loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 40.0o above the horizontal. The sledge moves a distance of 16.0 m on a horizontal surface. The coefficient of kinetic friction between the sledge

asked by Anonymous on October 8, 2012
50. ## Physics- Elena please help!

A sled loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 40.0o above the horizontal. The sledge moves a distance of 16.0 m on a horizontal surface. The coefficient of kinetic friction between the sledge

asked by Anonymous on October 10, 2012
51. ## Chemistry

I did the work, but I need help checking it... A compound contains 83.24% by mass carbon. Calculate the molar mass of the compound if it contains 5 moles of carbon per mole of compound. This was my process: I took 100g of compound and found that there are

asked by Kyle on January 26, 2012
52. ## calculus

Consider the function f(x) = 2 x^3 - 12 x^2 - 30 x+ 10 on the interval [ -6 , 8 ]. Find the average or mean slope of the function on this interval. Average slope = By the Mean Value Theorem, we know there exists at least one c in the open interval ( -6 , 8

asked by sze on January 26, 2018
53. ## Physics

A 9 kg object is given a displacement ∆~s = (4 m) ý + (3 m)ˆ J + (−4 m) k along a straight line. During the displace- ment, a constant force of ~ F = (1 N) ý + (−5 N) J + (7 N) k acts on the object. Find the work done by ~ F for this displace-

asked by Jim Kirk on September 28, 2010
54. ## URGENT MATH!!

Q1: Robert can paint a room in 12 hours. Dennis and Vince can paint the room in 10 hours & 9 hours respectively. If Dennis and Vince work together for 2 hours, How long will it take Robert to finish the job? I think it's 12 (because it says it, but I think

asked by Victoria on July 21, 2015
55. ## statistics

A computer course is conducted for 24 days.Each day 48 persons attended the course.To prepare a day wise work done sheet for all 24 days,find the estimated and the actual number of persons attended the course.Is the estimated value more or less than the

asked by Maths on October 25, 2011
56. ## Chemistry

If the partial pressure of CO2 is 2.87 atm the soluability in H2O is known to be 4.68 M. What would be the soluability of CO2 in H2O if the partial pressure is increased to 7.60 atm? Assume the temp is held constant. would it work to set up a proportion

asked by Jake on February 4, 2008
57. ## math

Gino just opened a pizza restaurant. He had 1 customer the first day, 3 the second day, 6 the third day, and 10 the fourth day. a. If this pattern continues, how many customers should gino expect on the seventh day? Day 10? Show the data table (for rate of

asked by unknown on October 12, 2011
58. ## Physics

An infinitely long, solid insulating cylinder with radius a has positive charge uniformly distributed throughout it with a constant charge per unit volume p. a) using Gauss's law, derive the expression for the electric field inside the cylinder ra c)

asked by Sally on June 15, 2016
59. ## Algebra (test corrections)

This problem was on a test and I got it wrong, and if I do it over I get half the credit back, but I need help with it plz. (11x^2+2x^3+14+17x)/(2x+5) My algebra teacher didn't even go over this lesson (we skipped it) and it was on the test. She says it's

asked by Emily on March 12, 2007
60. ## physics

Here is a demonstration Pascal used to show the importance of a fluid's pressure on the fluid's depth(Figure 1) : An oak barrel with a lid of area 0.17m2 is filled with water. Along, thin tube of cross-sectional area 5.0×10−5m2 is inserted into a hole

asked by bety on April 10, 2014
61. ## Science

a gummy bear experiment a solution of hot water and acid is used to see which solute would make the gummy bear dissolve faster. What is the dependent variable? Gummy bear Independent variable: hot water, and acid

asked by Sue on September 28, 2015
62. ## Chemistry

Okay, so I have to find the percent of water in each solution, but it involves different reagents and I'm not sure how to figure it out. Here's one example: Add all together - 4 mL water 2 mL of 0.01 M aqueous NaOH 2 mL acetone 2 mL 0.1 M alkyl halide in

asked by Sam on February 9, 2012
63. ## Chemistry

How do you calculate the molality of a salt solution using only temperature? Is it even possible to do so? This was part of an ice cream lab and the temperature of the ice was 1.0 degrees celcius and the temperature of the ice water salt mixture was -0.4

asked by Jamie on April 20, 2015
64. ## math,help

i need help with this one i've tried it many ways and still can't figure it out because it has the lines going between two solid lines. find the x-intercepts. y = x^2 +5x+2 x intercepts is when y is zero. 0=x^2 +5x+2 using formula 5/2 +- 1/2 sqrt (25-8)

asked by jasmine20 on April 15, 2007
65. ## Chemistry

In a solution of a weak acid and its conjugate base, which condition has to be true for pH to equal pKa? The concentration of acid has to be greater than the concentration of base. The concentration of acid has to be equal to the concentration of base. An

asked by Kristin on April 20, 2015
66. ## I am so lost

The freezing point of pure cyclohexane is 6.60°C and the freezing point depression constant is 20.00°C/m. The freezing point of a solution containing 0.161 g of an unknown nonelectrolyte solute and 5.818 g of cyclohexane was 3.98°C. What is the molar

asked by Anonymous on February 16, 2015
67. ## Dependent/independent

In a gummy bear experiment a solution of hot water and acid is used to see which solute would make the gummy bear dissolve faster. What is the dependent variable? Gummy bear Independent variable: hot water, and acid

asked by Sue on September 28, 2015
68. ## I am so lost

The freezing point of pure cyclohexane is 6.60°C and the freezing point depression constant is 20.00°C/m. The freezing point of a solution containing 0.161 g of an unknown nonelectrolyte solute and 5.818 g of cyclohexane was 3.98°C. What is the molar

asked by Anonymous on February 16, 2015
69. ## Social Studies

Help me please! Which is the best example of how Reagan dealt with the Soviet Union from a position of strength? development of the Strategic Defense Initiative U.S. withdrawal of the SALT II treaty from Senate approval Reagan condemning martial law in

asked by nonya on April 16, 2017
70. ## Social Studies

1. What value in American identity is most fundamental to the U.S. political system? A. individual rights *** B. social conformity C. national security D. freedom from rule -- 2. Why was Voting Rights Act of 1965 necessary? Select all that apply. A. Each

asked by please check answers! on September 25, 2018
71. ## chemistry - exam practice help!!

Given the table below predict the numerical value of the standard cell potential for the reaction: 2 Cr(s) + 3 Cu2+(aq) 2 Cr3+(aq) + 3 Cu(s) Half Reaction E (volts) (1) Cr3+ + 3 e- Cr E= -0.74 (2) Cr3+ + e- Cr2+ E=-0.41 (3) Cr2O72- + 14 H+ + 6 e- 2 Cr3+ +

asked by Anya on December 13, 2012
72. ## psychology

Consider that you are having an informative discussion with your adolescent child about sex. Your goal is to explain to your child that sexual arousal is a normal sensation attributed to the brain, neurochemicals, and sex hormones all working together.

asked by bettyboop on April 23, 2010
73. ## psy265

Consider that you are having an informative discussion with your adolescent child about sex. Your goal is to explain to your child that sexual arousal is a normal sensation attributed to the brain, neurochemicals, and sex hormones all working together.

asked by trudy on November 24, 2009
74. ## Physics

A 20% efficient real engine is used to speed up a train from rest to 7.0 m/s. An ideal (Carnot) engine using the same cold and hot reservoir would accelerate the same train from rest to a speed of 8.0 m/s using the same amount of fuel. The cold reservoir

asked by Anonymous on June 16, 2016
75. ## algebra

The office manager of a small office ordered 120 packs of printer paper. Based on average daily use, she knows that the paper will last about 40 days. What graph represents this situation? How many packs of printer paper should the manager expect to have

asked by lee on September 18, 2012
76. ## math

Julie wants to have a 90 average in her math class at the end of the year. She is trying to determine what she needs to make on her final exam for this to work. Everything is weighted equally and she currently has a 85 for her quiz average, a 80 for her

asked by hallie on March 14, 2016
77. ## English

Choose the option that corrects the error in the underlined portion. If no error exists, choose "No change is necessary." Ted told James that they had been given too much work by their boss and the deadline was tomorrow, which seemed unfair. Underlined

asked by Angela on June 24, 2014
78. ## physics

Let a force of 1500 Newtons act through a distance of 200 meters on a 1500 kg car which starts from rest. a. What is the work done? b. What is the final velocity? c. What is the car's momentum? d. What is the car's change in momentum? e. What is the car's

asked by Ryan on November 14, 2011
79. ## English

Choose the option that corrects the error in the underlined portion. If no error exists, choose "No change is necessary." Ted told James that they had been given too much work by their boss and the deadline was tomorrow, which seemed unfair. Underlined

asked by Angela on June 24, 2014
80. ## Algebra

Tina can weed her vegetable garden completely in 70 minutes. Her friend Marisa can do the same task in 40 minutes. If they work​ together, how long does it take Tina and Marisa to weed the vegetable​ garden?

asked by Dasia on February 21, 2017
81. ## physics

as a hiker descends a hill, the work done by gravity on the hiker is a.) positive and depends on the path taken b.) negative and depends on the path taken c) positive and indepedent of the path taken d.)negative and independent of the path taken

asked by tina on October 11, 2010
82. ## math

can someone check my work please? 1. Seven times a number, added to the sum of the number and eight. 7*x+8 2. A number multiplied by -7 less 11 X*(-7)-11 3. A number multiplied by 9, added to -8 X*9+(-8) 4. 8.7 less than a number 8.7-x 5. The sum of a

asked by Abby on September 16, 2015
83. ## physics

A 7.80-g bullet moving at 520 m/s penetrates a tree trunk to a depth of 4.60 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. N (b) Assuming the frictional force is constant, determine how much time

asked by monic on October 10, 2012
84. ## math

i usually catch the bus home from work.i get on at the first stop and have about 10 km to travel ,so i usually nod off to sleep.i normally fall asleep when the bus has about 3 times as far to go as it has already travelled.halfway through the trip i tend

asked by wan on September 2, 2012
85. ## Physics

A 61 kg skier on level snow coasts 184 m to stop from a speed of 12.0 m/s (A) use the work energy principle to find the coefficient of kinetic friction between the skis and the snow. B) suppose a 75 kg skier with twice the starting speed coasted the same

asked by Sarah on June 22, 2009
86. ## ENGLISH

can you please help me to solve this task? Complete the sentences with the correct form of the verbs in brackets. I 1 _____________________ (go) to the gym for quite a long time and I 2 _____________________ (still wait) to see some results. Every time I

asked by anna on June 27, 2013
87. ## bus math

Solve the problem. Express answers as a percent rounded to the nearest tenth. 20) Complete a vertical analysis on the balance sheet for Jake's Janitorial Service for December 31 of last year. The company assets are cash \$20,000, accounts receivable

asked by damerius on July 12, 2016
88. ## Algebra

There are two questions that I am having trouble with one says Emily wants 400 ml of a solution that is 11% HC1. If she has only 8% HC1 and 16% HC1, how much of each should she use? and On a trip, Debbie spent as much time on the train as she id on the

asked by Mai on September 16, 2007
89. ## calculus

The total cost of producing x units is C(q) = 2q3- 6q2-18q+108 (a) At what level of production will the total cost be minimized? (b) At what level of production will the marginal cost be minimized? (c) At what level of production will the average cost be

asked by Anonymous on November 8, 2011
90. ## Chemistry

At 20 C (approximately room temperature) the average velocity of N2 molecules in air is 1050 mph. What is the velocity of a molecule of N2? What is the kinetic energy of a N2 molecule with this velocity? What is the kinetic energy of a mole of N2? I know

asked by melinda on March 13, 2011
91. ## pre-algebra

You are working on a polynomials problem with algebra tiles. You have five big squares, seven rectangles, and eight small squares on your desk. your classmate leans over and borrows three big squares, one rectangle, and five small squares. Write an

asked by Dj on March 17, 2008
92. ## Precalculus

i need to show that the given equation is an identity. using composite argument properties. (cosAcosB-sinAsinb)^2 + (sinAcosB+cosAsinB)^2 = 1 Composite argument properties: cos(A + B) = cosAcosB - sinAsinB sin(A + B) = sinAcosB + cosAsinB Substituting:

asked by Andrew on November 30, 2006
93. ## Physics

About 5.12 x 104 m above Earth's surface, the atmosphere is sufficiently ionized that it behaves as a conductor. The Earth and the ionosphere form a giant spherical capacitor, with the lower atmosphere acting as a leaky dielectric. Find the capacitance C

asked by jason on February 16, 2012
94. ## Mechanics

A light inextensible string, which passes over a fixed smooth peg A, is fastened at one end to a small ring R of mass 0.1kg and at the other end to a particle P of mass 0.3kg. The ring is threaded on a fixed rough vertical wire and the system rests in

asked by Abdel moniem on February 28, 2014
95. ## Math

In a zoo, 21% of the animals are reptiles and 11% are birds. There are a total of 1,500 animals in the zoo. Which proportion can be solved for r, the number of reptiles? A. 21/100 = r/1,500 B. 11/21 = r/1,500 C. 11/100 = r/1,500 D. 100/21 = r/1,500 I'm not

asked by FNAF Girl on September 4, 2018
96. ## m

Two (2) Buckets were bought for X dollars each (\$X) and a third bucket is bought for \$less than twice the price of the first two buckets. (a) Write down an expression for the total cost of the three buckets (b) If the total cost of the buckets was less

asked by JERMAINE on February 9, 2010
97. ## MATHS

Two (2) Buckets were bought for X dollars each (\$X) and a third bucket is bought for \$less than twice the price of the first two buckets. (a) Write down an expression for the total cost of the three buckets (b) If the total cost of the buckets was less

asked by JERMAINE on February 9, 2010
98. ## Math

Please help solve these word problem.vanita types 72 pages of notes in a day .she types 1/2 of the pages in the morning and 1/3 of the pages in the afternoon .she types the rest of the pages in the evening .how many pages of notes does she type altogether

asked by Tabassum sultana on January 25, 2019
99. ## Math

A lender oﬀers a choice between two loans. For loan A the lender charges 12% a year compounded 12 times a year. For loan B the lender charges 12.5% a year and compounds it once a year. Is loan A or loan B a cheaper loan for the borrower. What formula do

asked by Mark Jackson on June 17, 2017
100. ## Chemestry

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) (a) Determine the mass of gold that can be extracted if 29.3 g sodium

asked by Kenah Smith on February 6, 2013