# 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 710
1. ## Physics

a truck drives 60 m in 5s, while uniformity slowing to a stop. The average speed during this process is 12 m/s. What is the trucks jnitial speed at the beginning of this process? What is the magnitude of the trucks acceleration during this process? I have

asked by Maria Garcia on February 28, 2017
2. ## physics

A 1.7 kg block is moved at constant speed over a surface for which the coefficient of kinetic friction is 0.27. The displacement is 2 m. It is pushed by a force directed at 25 degrees below the horizontal. Find the work done on the block by: the force. How

asked by joe on October 29, 2011
3. ## math

Find the representation of the number 256 in the following bases: a. base six b. base twelve c. base two I get how to write the number of objects as a base(whatever), but I think this is asking me to start from the end number and work backwards. I really

asked by Lauren on September 3, 2009
4. ## Physics

Sau-Lan has a mass of 47 kg. She rides the up escalator at Ocean Park in Hong Kong. This is the world's longest escalator, with a length of 227 m and an average inclination of 31°. How much work does the escalator do on Sau-Lan?

asked by Iklishi on November 6, 2011
5. ## precalculus

will someone please check my work? find two sets of parametric equations for the given rectangular equation x+y^2=4 x=-y^2+4 y=-t^2 x=-t^2+4 x=-t^3 y=-t^3+4 Find a polar equation of an ellipse with its focus at the pole an eccentricity of e=1/4 and

asked by Anonymous on December 13, 2016
6. ## math

a 5ft pole is situated on top of a building. a 25ft pole extends from the top of the pole to a point on the ground creating a 26 degree angle. find the height of the building. please help me work this problem

asked by moniqui on January 5, 2012
7. ## Physics

70 J of work are done on the gas in the process shown in the figure. What is V_f in cm^3 ? I have a graph but I can't post it here. My values are W=70J P=200kPa which is 200000Pa I used the formula W=P(deltaV) then to get deltaV you do: deltaV= W(P) so i

asked by Ana on December 12, 2009
8. ## Chemistry

I would really appreciate help with the following, as I don't understand how to work it. Thank you in advance for explaining it to me. The mass number (A) of a nuclide is equal to the number of --- blank --- in one of its nuclei. There are 4 answers to

asked by Jean on July 24, 2010
9. ## pre calculus

can you check my work? find two sets of parametric equations for the given rectangular equation x+y^2=4 x=-y^2+4 y=-t^2 x=-t^2+4 x=-t^3 y=-t^3+4 Find a polar equation of an ellipse with its focus at the pole an eccentricity of e=1/4 and directrix at y=4.

asked by Anonymous on December 13, 2016
10. ## Algebra

A furnace repair service charged a customer \$80 for parts and \$65 per hour worked. The bill totaled \$177.50. About how long did the repair technician work on the furnance? A. 0.5 hour B. 1.5 hours C. 2 hours D. 47.1 hours

asked by Anonymous on May 8, 2014
11. ## math

Please help Mr. Chavez owned 3/4 of a family business. He sold 1/2 of the business to his sister. what portion of the business does he still own? a. 5/4 b. 1/4 c. 1/5 d. 4/5 Answer: b Gasoline is about \$2 per gallon. You use about 1 1/2 each day driving to

asked by Kim on February 23, 2008
12. ## physics

A 2 kg mass falls 40 m and buries itself into the ground 0.40 m. Find: a) How much work was done by gravity, b) How much potential energy was lost, and c) What was its speed when it hit the ground, and d) the average force causing the mass to stop once it

asked by Ted on November 28, 2012
13. ## math

Imagine that I am hiring you to work for me for the next month (30 days). Would you rather have \$10,000 in a single payment on the 30th day? Or would you rather be paid by the following schedule: on the first day, \$0.01; on the second day, \$0.02; on the

asked by Tiffany on May 30, 2012
14. ## physics

a 0.85 kg block of aluminum is heated at atmospheric pressure so that its temperature increases from 22degC to 40degC. find the work done on the aluminum? find the energy added to it by heat? find the change in its internal energy?

asked by jenn on February 2, 2010
15. ## physics

One kilogram of an ideal gas is heated from 27*C to 327*C. If the volume of the gas remains constant, the ratio of the pressure of the gas before heating to the pressure after is a. 1:4 b. 1:3 c. 1:2 d. 1:1 Work: 1atm/293K=P/(327+273) P=2 So, from what I

asked by Anonymous on November 23, 2007
16. ## science

Napolweon pencil has a mass of 3 grams (0.27Napoleon ) when he lifts his pencil from the desk to his paper he moves it an average of 20cm (o.20m) He then returns it to his desk moving it another 20cm How much work did he do on his pencil? w=FXD

asked by Barbara on October 24, 2009
17. ## English

I just want you to check my word choice. There are a few sentences I rephrased I'm not sure of.(Sentences 2.3.4). I really hope you'll help me improve my writing skills. Thank you for your help. 1) His father was a German from Bremen, who first settled in

asked by Franco on March 14, 2010
18. ## Intermediate Accounting

Accounting Homework Question: Pension Amendment Case Charles Rubin is a 30-year old employee of General Motors. Charles was pleased with recent negotiations between his employer and the United Auto Workers. Among other favorable provisions of the new

asked by Sarah on March 19, 2008
19. ## English

How is Hamlet hypocritical with Rosencrantz and Guildenstern? Provide 2 examples. Please note that we don't do students' homework for them. Our tutors try to give you the information to help you complete your assignment on your own. Be sure to go back into

asked by Raj on May 3, 2007
20. ## chemistry

A student weighs out a 14.4 g sample of copper(II) bromide, transfers it to a 500 mL volumetric flask, adds enough water to dissolve it and then adds water to the 500 mL tic mark. What is the molarity of CuBr2 in the resulting solution The answer I keep

asked by Melissa on May 1, 2017
21. ## Intermediate Algebra

The area of a rectangular athletic field is represented by the expression 12y^3+48y^2+24y square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense "length times width" ) of the athletic field. Include correct

asked by Kayla on September 6, 2011
22. ## math

The area of a rectangular athletic field is represented by the expression -15x^5+75y^3-30xy square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include

asked by kozy on April 28, 2011
23. ## chemistry

A coffee-cup calorimeter is filled with 50 mL of 1 M NaOH and 50 mL of 1 M HCl, both at room temperature. After the reaction is complete, the final temperature of the solution is 32.5 degree C. Using the specific heat of water, calculate the heat of

asked by meryl on September 22, 2018
24. ## chemistry

When 0.627 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 102C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. The molar heat of reaction, H rxn,

asked by joshua on February 24, 2008
25. ## CHS Chemistry

My paper has a picture of a beaker and in it it had the names: Na+(aq), C2H302-(aq), and SrSO4(s). The directions say: Your lab partener tells you that she mized two solutions that contain ions. You analyze the solution and find that it contains the ions

asked by Chelsea on October 21, 2009
26. ## Chemistry

I cannot figure out this problem. It says to "Calculate the mole fraction of MgCl2 (subscript 2) in a solution created by dissolving 132.1 g of MgCl2 in 175 mL of water." I started by converting 132.1g to moles, but I got stuck when I tried to convert

asked by Ana on April 12, 2019
27. ## algebra

The area of a rectangle athletic field is represented by the expression 12y^3+48y^2+24y sqaure meters. write an algebraic expression to represent one possible set of dimensions (in the same sense ''length times width'') of the athletic field. include the

asked by Liz on February 11, 2011
28. ## chemistry (Pls Bob check for me)

0.5g of fuming h2s04 oleum is diluted with water. This solution is completely neutralized by 26.7ml of 0.4N naoh. Find the percentage of free so3 in the sample My calculation h2s04 = 98g/mol s03 = 80g/mol 98/2 = 49 80/2 = 40 26.7ml x 0.4n = 10.68ml -

asked by Fai on March 31, 2013
29. ## chemistry

A 211 g sample of barium carbonate, BaCO3, reacts with a solution of nitric acid to give bar- ium nitrate, carbon dioxide and water. If the acid is present in excess, what mass and volume of dry carbon dioxide gas at STP will be produced

asked by myrtle on May 14, 2013
30. ## chemistry

When 0.627 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 102C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. The molar heat of reaction, H rxn,

asked by Anonymous on February 25, 2008
31. ## Math algebra

The radiator in a car is filled with a solution of 60% antifreeze and 40% water. The manufacturer of the the antifreeze suggests that, for summer diving, optimal cooling of the engine is obtained with only 50% antifreeze. If the capacity of the radiator is

asked by Shane on November 24, 2015
32. ## Chemistry

Pheromones are compounds secreted by the females of many insect species to attract males. One of these compounds contains 80.78%C, 13.56%H, and 5.66%O. A solution of 1.41g of this pheromone in 9.23g of benzene freezes at 2.73 degrees C. what are the

asked by Rory on October 18, 2010
33. ## algebra

The area of a rectangular athletic field is represented by the expression 16y^7+32y^5+80y^3 square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include

asked by Rihanna on February 9, 2011
34. ## Chemistry

Experiment on Titration of Acids and Bases Suppose some deionized water was left in the buret before it was filled with the oxalic acid solution you were using as a primary standard. When you perform the standardization of sodium hydroxide in Part 3, how

asked by Jerome on December 7, 2010
35. ## intermidiate Algebra

The area of a rectangular athletic field is represented by the expression 16y^7+32y^5+80y^3 square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include

asked by Elisa on June 19, 2011
36. ## Physics

A car and driver weighing 7740 N passes a sign stating “Bridge Out 27.7 m Ahead.” She slams on the brakes, and the car decelerates at a constant rate of 12.3 m/s^2. The acceleration of gravity is 9.8 m/s^2. What is the magnitude of the work done

asked by Jess on February 14, 2015
37. ## Calculus

2. The slope of the tangent line to the graph of the exponential function y=2^x at the point (0,1) is the limit of (2^x-1)/x as x approaches 0. Estimate the slope to three decimal places. My work: (-1,0.5) (-0.5,0.586) (-0.9,0.516) (-0.999,0.5) (0,empty)

asked by Anonymous on September 26, 2014
38. ## Math

I don't have any specific problems I need help with, but I'm a bit confused about two things: 1) Where 2^x - 1 = y, is x or y the Mersenne prime? 2) I have noticed that in some cases, such as 27 * 3, I can break the problem up and arrive at the correct

asked by Jack on October 12, 2007
39. ## English

Find words in the word bank that are the opposite of the words in CAPS. The work bank is the same. sailing across the TINY ocean immense knew when to KINDLE the torch douse? EXPAND the bundle to fit compress? was certain to GLADDEN the passengers irk?

asked by Jerald on September 12, 2012
40. ## english

Write an editorial (persuasive essay) in which you research and present the conflict, being sure to state your sound third person opinions as to why Dr. King's methods for achieving justice would or would not work in this case. Remember that for your voice

asked by reneae on March 30, 2019
41. ## Precalculus

I'm sorry I'm posting so many questions, I promise this is the last one tonight :) The leading coefficient of a cubic polynomial P is 2, and the coefficient of the linear term is -5. If P(0)=7 and P(2)=21, find P(3). I DO NOT understand how to even start

asked by Emily on September 1, 2009
42. ## Social grade 7

The Irish Potato Famine, unemployment, poverty, and the lack of farmland were some of the reasons why people immigrated to British North America. Thesee reasons are: A. Pull gators of immigration B. Push factors of immigration. C. All in a days work. D.

asked by Sally on April 11, 2017
43. ## Calculus

What is the maximum volume in cubic inches of an open box to be made from a 16-inch by 30-inch piece of cardboard by cutting out squares of equal sides from the four corners and bending up the sides? Your work must include a statement of the function and

asked by Mel on January 8, 2016
44. ## Social Studies

Which statement best explains how life is changing in China? A. New articulture techniques are making lakes cleaner. B. People are moving away from cities to live near their hometown. C. Growing pollution is discouraging the rise of factory work. D. Strong

asked by CanYouHelpMe on March 14, 2017
45. ## Physics

A 53 kg student eats a 200 Calorie doughnut. To “burn it off”, he decides to climb the steps of a tall building. (1 food Calorie = 103 Calories.) How high would he have to climb to expend an equivalent amount of work? The accelera- tion of gravity is

asked by Tori on January 10, 2011
46. ## Chemistry

a) A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg? b) For potassium metal, the work function W (the minimum energy needed to eject an electron from the metal surface) is 3.68 ×

asked by Adam on October 5, 2014
47. ## ETH/125

55. A firm maintains policies that make it difficult for parents to take time off from work to care for sick children or attend required meetings at their children’s schools. Since it is mothers, for the most part, who have these child-care

asked by beckylynn on July 23, 2013
48. ## math

What is the maximum volume in cubic inches of an open box to be made from a 12-inch by 16-inch piece of cardboard by cutting out squares of equal sides from the four corners and bending up the sides? Your work must include a statement of the function and

asked by Anonymous on May 4, 2015
49. ## physics

A car and driver weighing 7750 N passes a sign stating “Bridge Out 28.5 m Ahead.” She slams on the brakes, and the car decelerates at a constant rate of 10.6 m/s2 . The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the work done

asked by Kaylee on June 24, 2014
50. ## Chemistry

Thanks to Dr. Bob for answering all these questions! I always do poorly on conceptual problems. Consider the following equilibrium system at 25°C and select the true statement below: H2PO4−(aq) + SO42−(aq) ↔ HSO4−(aq) + HPO42−(aq) ΔG°rxn > 0

asked by Richard on February 27, 2017
51. ## (1-11) Chemistry - Science (Dr. Bob222)

Liquid chloroform (CHCl3) is placed in a closed container and allowed to equilibrate with chloroform vapor. With the temperature held constant, additional chloroform is introduced into the system, and the vapor-liquid equilibrium is reestablished.

asked by Ana on May 10, 2014
52. ## Chemistry

Question: Consider following equilibrium system: SO2(g)+ Cl2(g) goes to So2Cl2(g) Kp=.900 atm @25 degree C. Suppose that 2.0 moles S02, 1.0 moles Cl2, and 3.0 moles So2Cl2 are placed in an empty 4.00L vessel at 25 degree C. Compute the number of grams of

asked by eliz on March 1, 2009
53. ## math

how do you solve this can you do this with the steps do I an understand them,please. 3 outside the square root like a cube. (square root start) 64x^6/27 (square root end)

asked by Anonymousab on June 15, 2013
54. ## math

How do you solve this problem? Find the slope-intercept equation of the line that has the given characteristics. Slope 8 and y-intercept (0,5) The slope-intercept equations is y=

asked by samuel-32 on January 13, 2011
55. ## Maths

Please solve this trigonometric identity proof problem. I have completed 20; this is the hardest one. Many thanks (sin^3(x)-cos^3(x))/sin(x)-cos(x)=1+sin(x)cos(x)

asked by Joe on April 12, 2017
56. ## Math

You do not have enough 6-inch beads to make the rope, so you will use 10-inch beads instead. Write and solve an inequality that represents the number of 10-inch beads that you can use.

asked by Kevin on December 2, 2016
57. ## English

How many activities did you have on Monday? 1. I had three activities on Monday. 2. I did three activities on Monday. (Are both answers correct? ....Thank you for your help. With your help, I can solve a lot of problems.....Have a good time.)

asked by rfvv on September 2, 2010
58. ## Social Studies

Buddhism became popular in part because it did not defend.... 1. dharma 2. the Hindu gods 3. the caste system**** 4. life after death This religion believes that the way to stop suffering is to stop desire 1. Buddhism*** 2. Judaism 3. Hinduism 4. Jainism

asked by Anonymous on January 30, 2017
59. ## Physiology

Indicate the site of the following activity in the digestive system (mouth, esophagus, stomach, small intestine, large intestine, liver, gall bladder, pancreas). 1.breakdown of cholesterol by formation of bile acid 2. principal site of formation of folic

asked by ivy on May 18, 2011
60. ## math

TILING A decroative floor pattern has one red square tile surrounded by 12 blue tiles. Write and evaluate an expression to show how many total tiles (red and blue) are needed if there are 15 red tiles. Then make a table showing the total number of tiles if

asked by cassandra on September 14, 2011
61. ## Geometry

1. The sides of a triangle have lenghts x, x+4, and 20. Specify those values of x for which the triangle is acute with the longest side 20. 2. use the information to decide if triangle ABC is acute, right, or obtuse. AC=13, BC= sq. rt. 34, CD=3 >>i know

asked by Anna-Marie on March 3, 2008
62. ## math

Tran has made a plan to help him study for his math exam. He has broken down the material that he has to study into two parts: part A and part B and has, at most, 2 hours every evening over the next week to study. He wants to spend at least twice as much

asked by Britney on July 4, 2019
63. ## math

Two friends are playing a variation of MasterMind where one friend tries to guess the three digit number that the other friend is thinking of. The rules of the game are as follows: -Digits can be repeated -Zero cannot be the first number, but zero can be

asked by S on February 14, 2019
64. ## physics

A rock thrown horizontally from a bridge hits the water below at a horizontal distance x directly below the throwing point. The rock travels a smooth parabolic path in time t. A.) Show that Therapy vertical distance of the bridge above water is 1/2gr2. B.)

asked by liz on March 29, 2012
65. ## chemistry

An environmental chemist needs to determine the amount of Fe+2 ions in a simple of polluted water from a rusting industrial plant. one procedure is to analyses the sample by using solution of sodium dochromate, Na2Cr2O7. identify the oxdising agent and the

asked by cletus on February 21, 2017
66. ## science

what does shaking do that inceases the solubility of a solution? Shaking does not affect the solubility, but it will increase the rate that solids dissolve, and will also promote the formation of an emulsion if the ingredients are not soluble (e.g, vinegar

asked by jenna on June 21, 2006
67. ## chemistry

The compete oxidation of 2g of an aldehyde A by acidified potassium chromate produces 2.1g of carboxylic acid B which is dissolved in 50 ml of distilled water . The obtained solution reacts with exactly 1.05 g of solid lime to form salt C a) Write the

asked by dani on July 20, 2016
68. ## General Chemistry

The formula of a compound of lead (Pb) and sulfur (S) was determined using the method in this module. A sample of Pb was weighed into a crucible and covered with finely powdered S. The crucible was covered and heated to allow the Pb and S to react.

asked by Liv on February 12, 2018
69. ## Chem- bobpursley

What mass of protons would be required to just neutralize the charge of 1.5 g of electrons? my teacher said .0015kg times 1e-/.00091e-27kg times 1pt/1e- times 1.67262e-27 over 1 p chem - bobpursley, Tuesday, September 21, 2010 at 6:48pm That is what I

asked by Sara on September 21, 2010
70. ## English

After you solve the cross word puzzle, using the answer words, complete the dialogue between a teacher and a student. Look at the first row, Across one starts with 's.' Down four contains one r. What is the suitable word for Down 1? Across 6 ends with l.

asked by John on April 15, 2009
71. ## Logarithm help

Use logarithms for these questions After every 10 pages of painting, the ribbon in the dot matrix printer loses about 0.5% of its ink. A) What percent of the ink is left in the ribbon after printing 100 pages and 1000 pages I have no idea how to solve this

asked by Joe on September 18, 2015
72. ## Physics

My question is two parts How many calories of heat energy would it take to heat 200 mL of water from 20C to 80C? a) How long would it take to heat the water in the previous question using a heater with a power rating of 50W? Looking for equations to solve

asked by college on July 2, 2010
73. ## Help!!

What caused states to demand a constitutional Convention and explain why? What three issues caused the most conflict during the Constitutional Convention and why? How did the COnstitutional delegates solve these problems? Plese tell me good site and teach

asked by cc on October 19, 2006
74. ## Pre-algebra

I can't figure out how to solve: Question #1: Two number cubes are rolled and a coin is tossed. Find the number of possible outcomes. Question #2: What is the probability of winning a lottery game where the winning number is made up of 6 digits from 0-9

asked by Tyler on December 3, 2009
75. ## ap chem

Under constant-volume conditions the heat of combustion of glucose is 15.57 kJ/g. A 2.500g sample of glucose is burned in a bomb calorimeter. The temperature of the calorimeter increses from 20.55 C to 23.25 C. What is the total heat capacity of the

asked by lily on September 26, 2007
76. ## RATE, DISTANCE, TIME

TIM PADDLED HIS KAYAK 12 KM UPSTREAM AGAINST A 3 KM/H CURRENT AND BACK AGAIN IN 5 HR 20 MINUTES. iN THAT TIME HOW FAR COULD HE HAVE PADDLED IN STILL WATER 12/(v+3) + 12/(v-3) = 5.33 hours Solve for this speed in still water, v. 12(v-3) + 12(v+3) = 5.33

asked by CINDY on December 21, 2006
77. ## math

Finding a break-even point: How do I set up the equation and solve? Producing a musical costs \$88,000 plus \$59,000 per performance. One sold-out performance earns \$7500 in revenue. If every performance sells out, how many performances are needed to break

asked by Jane on January 10, 2012
78. ## math

A car rental company charges \$280 per week plus \$0.18 per mile to rent a car. How many miles can you travel in one week for \$433? A) Write an equation you can use to answer this question. Be sure all the numbers given above appear in your equation. Use x

asked by kelly on February 21, 2013
79. ## Pre-Cal/Trig

Explain how to solve the following question. Surveying: From a point A hat is 10 meters above level ground, the angle of elevation of the top of a building is 42 degrees and the angle of depression of the base of the building is 8 degrees. Approximate the

asked by Monica on October 24, 2012
80. ## algebra

you are building a rock wall for a flower bed along your 38-foot long driveway. You Want the wall to be one-half of the length of the driveway with an absolute deviation of at most 3 feet. write and solve an absolute value inequality that represents the

asked by draven on September 29, 2015
81. ## math

The Grade 8 students had a graduation dinner. They paid a flat rate of \$125 for the use of the hall, plus \$13 for each student who attended. The total cost of the dinner was \$944. How many students attended the dinner ? Write an equation to solve the

asked by Cherie on March 14, 2013
82. ## math

Translate the following situation into an inequality. Do not solve. “Charlie would like to pack one less outfit than Jane for their trip. Loretta would like to bring five outfits less than twice what Jane packs. Due to space in the suitcase, they are

asked by Anonymous on March 16, 2011
83. ## Chemistry

A mixture of gases contains 0.65 mol of N2, 0.70 mol of O2, and 0.90 mol of He. What is the partial pressure of each gas (in atm and in torr) in a 25.0 L cylinder at 340 K? What is total pressure? I know you: Use mols each gas in PV = nRT and solve for p.

asked by Chelsey on February 26, 2014
84. ## Thinking Mathematically

solve A Flag Pole Has A Height Of 16 Yards. It Will Be Supported By Three Cables, Each Of Which Is Attached To The Flagpole At A Point 4 Yards Below The Top Of The Pole And Attached To The Ground At A Pole. Find the total number of feet of cable that will

asked by Edward on September 23, 2012
85. ## calculus

Find the lenght of the sides of an isosceles triangle with a given perimeter if its area is to be as great as possible. let k be the the length of the two iso sides, so the other side is P-2k. Call that the base. Using Heron's formula:

asked by amy07 on March 9, 2007
86. ## Question

What causes young people to abandon school? My opinion. You need to obtain other opinions. I think many young people are tired of school after 12 years of it from first grade through the end of high school. And with so many families with both parents

asked by Zoie on June 18, 2006
87. ## Math

Please solve problems. Joanne earns \$720 a week. She spends 1/3 of her money on rent and 3/4 of the remaining money on groceries. How much money does she spend on both rent and groceries?

asked by Tabassum sultana on January 26, 2019
88. ## Geometry

Solve for z. I got z=72 degrees and i don't know how I got it. The circle has diameter AB then another diameter CD. Arc AD = 40 degrees then angle DEB = 124 degrees and z = BC. The diameter DC intersects diameter AB. Please help i can't figure it out and

asked by Lexy on June 16, 2015
89. ## time speed and distance

P, Q and R start from the same place X at (a) kmph, (a+b) kmph and (a+2b) kmph respectively.  If Q starts p hours after P, how many hours after Q should R start, so that both Q and R overtake P at the same time? Answer is pa/a+2b Please solve this

asked by Dharmesh on October 27, 2016
90. ## maths

find the roots of the equation X(square)+7x equal to 0.(b)write down the equation whose roots are -2 and 5. I will be happy to critique your thinking. Write the equation, and solve. In the second, hint: (x+2) is one factor.

asked by nikita on June 6, 2007
91. ## math

wire is cut into 2 pieces with one piece 14 feet shorter than other.The wire was 66 feet before cut,how long is the the shortest lenght of wire,shoe steps to solve

asked by Anonymous on December 5, 2012
92. ## honors chem

determine the mass of the following example 1.3 x 10^26 iron atoms in iron III oxide, mass of iron II oxide I know this is a 2 part question and you have to use Avogadro's number, but I am clueless as to how to solve it.

asked by keeley on September 21, 2015
93. ## Math

On a test I was given 2 triangles. One triangle gave measurements of all three sides as 2, 4, and 5. The next triangle had sides given 4 and 8 and it asked what the third side should be if the triangles were perpendicular. How would I solve this? Do I find

asked by Sheila on January 13, 2017
94. ## Math

A drug in the bloodstream has a concentration of c(x) =3t/t^2 + 1 Approximate the highest concentration of the drug reached in the bloodstream Determine how long it takes for the drug to drop below 0.2. Solve algaebraically

asked by Rose on November 29, 2015
95. ## Algebra

Yesterday a store earned \$797.30 just from the sale of cookies. Write and solve an equation that represents how many cookies were sold. c= \$797.30/\$1.19 c=670 cookies were sold

asked by Mary K on August 2, 2009
96. ## Algebra

Solve the equation. Use factoring or the quadratic formula, whichever is appropriate. Try factoring first. If you have any difficulty factoring, then go right to the quadratic formula. (Enter your answers as a comma-separated list.) (x+2)^2 + (x-7)(x-2)=16

asked by Merty on April 17, 2015
97. ## Physics

Solve this question, the resultant of two force acting at right angle to each other on a body is ten newton. If the angle between the resultant and one of the force is sixty degree, find the force.

asked by Adeleke on October 12, 2011
98. ## math

roger is 5 feet tall and casts a shadow 3.5 feet longer. at the same time,the flagpole outside his school casts a shadow 14 feet long. write and solve a

asked by curzanae on August 19, 2016
99. ## math

A drug in the bloodstream has a concentration of c(x) =3t/t^2 + 1 Approximate the highest concentration of the drug reached in the bloodstream Determine how long it takes for the drug to drop below 0.2. Solve algaebraically

asked by Rose on November 29, 2015
100. ## Math

How do I solve this? There are 171 seventh graders eating lunch. This number represents 45% of all of the seventh grades. How many 7th graders are there in the school? Would I take 171 x 45% and add them together or take 171 X .55 or??

asked by Tyler on April 9, 2008