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Posts by Cody

Total # Posts: 468

physics
a 1540 kg truck is traveling at 95 km/hr. what average force is required to stop in 10 seconds

Math Investigations II
For what value of k will the system be dependent? x+3y+2z=-4 3x+4y-z=2 3x-y-8z=k I'm confused as to what exactly it's asking for by a dependent system. I know this is a system with infinite solutions, but I don't know how to find that in 3 dimensions.

math c30
i will use n to represent pi because it is much easier to read (-n/4+15n/4)/2 = 7n/4 ((-n+15n)/4)/2 = 7n/4 (14n/4)/2 = 7n/4 since dividing by 2 is the same as multiplying by 1/2, the 14n/4 becomes 14n/8 which equals 7n/4.

Physics
Thank you very much. I used sin21 and it was right.

Physics
One end of a cord is fixed and a small 0.470-kg object is attached to the other end, where it swings in a section of a vertical circle of radius 2.50 m as shown in the figure below. When θ = 21.0°, the speed of the object is 4.70 m/s. At this instant, find each of the...

math (radicals)
the answer to this expression is -9-4√5 the expression is (2+√5)/(2-√5) i cant figure out how it got there

Physics
yeah

math
first off, that is one creeeeepy topic to study. mean is all the numbers added together and then divided by the number of elements, so in the case of 5,2,3,1,8, i add like 5+2+3+1+8 and divide this number (19) by 5, the number of elements used, and the mean is 3.8. how your ...

3rd grade
-_- fail. i just failed a 3rd grade math problem and i live at the illinois math and science academy. that is just sad

3rd grade
if the one is 5 and the hundreds is 8, then it is 5._8, and 5 + 8 + _ = 16, so you subtract 5+8 from 16 and get 3, so the number is 5.38

algebra
wow that looks so much more complicated than it is. the square root of 5 over the square root of 15, if the parentheses and crap above was confusing

algebra
rationalize denominator and simplify: v/...| is square root (v/5))/(v/15)) please help

math
the -30 -30 was subtract 30 from both sides. it lined up in the box but not when posted -_-

math
let the distance from c --> d be x if b --> c is ten miles farther than x, then let that distance be x+10 same for a --> b. it is 10 further than b --> c (x+10), so it would be x+10+10, or x+20 so look at it like so: a --x+20->b--x+10->c--x->d the total ...

MATH PLZ HELP
well i'm stumped. i can't figure out how to solve this. solve for (x,y): 3/x + 2/y = 0 5/x - 1/y = 13 i can't graph it, and i can't use a calculator. i keep getting stuck on the second equation b/c i get 5y -13xy -x=0 and since 13 is a prime number i cant ...

physics
160-115 = distance from position to town, and as for his current position is this the whole question because i cant tell the position from where exactly

algebra
0.75 x 620

experiment
it turns green, and its called a patina. the statue of liberty is copper and the green is from the patina coating it

algebra
well i'm stumped. i can't figure out how to solve this. solve for (x,y): 3/x + 2/y = 0 5/x - 1/y = 13 i can't graph it, and i can't use a calculator. i keep getting stuck on the second equation b/c i get 5y -13xy -x=0 and since 13 is a prime number i cant ...

7th lang arts
yeah, duration

7th lang arts
if the context is a measurement, then duration would be it because duration is a measurement of time

social studies
The Constitution of the United States is the supreme law of the United States of America. It is the framework for the organization of the United States government and for the relationship of the federal government with the states, citizens, and all people within the United ...

physics
i hate to tell you this, but you were wrong. the putty was better because it was one pin, and when looked at in terms of momentum, the rubber ball retains much of its momentum, just negative. the putty retans no momentum, transferring it all to the pin.

physics
to knock them over. its dealing with elastic/inelastic/totally inelastic collisions

physics
you throw 2 balls at a bunch of pins. is it better to throw a putty or rubber ball?

science
3 scientistperform the same experiment. 2 of them got the same answers, 1 of them got something completely different. what should these 3 peple do before trusting their answers and sharing their results with others?

precalculus
the variable j varies jointly as the square of h and as the cube root of a, and it varies inversely as s. What happens to j when h is doubled, a is multiplied by 8, and s is multiplied by 4?

pre-algebra
Thank you, 450-366=84

pre-algebra
Ms. Sue, wher did you come up with 500*0.9?

pre-algebra
Solve, show the algebraic you use. Tammy has the following scores on her business law tests 92, 99, 84, 91. What score must she earn on her fifth test in order to have an A average? An A for her university starts at 90.

pre-algebra
You are traveling to your mother's house that is 234 miles away. If you are currently twice as far from your home as you are from your mother's house, how far have you traveled?

pre-algebra
x=24056.6

pre-algebra
If Denise received a 6% raise and is now making $25,550 per year, what was her salary before the raise?

pre-algebra
Write the equation for the given graph. 8,8,-8

pre-algebra
10.18

pre-algebra
Solve the problem. Please show all of your work. A driveway rises 11 feet over a horizontal distance of 112 feet. Find the slope of the driveway. Round your answer to two decimal places.

pre-algebra
(x1,y1)(x2,y2) -2-(-2)/-7-(-5) = 0/-2

pre-algebra
Find the slope of the line containing the given pairs of points. If the line is undefined, state so. Please show all of your work. (-5, -2) and (-7, -2)

pre-algebra
Find the x- and y- intercepts for the equation. -x+2y=4 Please show all of your work.

pre-algebra
Find the y- intercept for x+y=5.

pre-algebra
Write the equation of this situation: the value,v, in hundreds of dollars of Debbie's coin collection is 10 dollars more than 1/2 of the age, t (in years). Then determine the value of Debbie's coin collection of it is 8 years old. Please show all of your work.

pre-algebra
Given the linear equation y=-5x-2. Find the y-coordinates of the points (-1), (-2), and (1). Please show all of your work.

pre-algebra
40

pre-algebra
The salaries ( in thousnds of dollars) of the managers of five local hardware stores are 50, 70, 60, 80, and 90. What is the difference between the highest paid and lowest paid managers?

pre-algebra
You divide, 72.9/125=0.5832

pre-algebra
What percent of 125 is 72.9%?

pre-algebra
41.772/.59=70.8

pre-algebra
41.772 is 70.8% of what number?

pre-algebra
4756.32

pre-algebra
What is 648% of 734?

pre-algebra
21/40*100=52.5%

pre-algebra
Convert 21/40 to a percent.

pre-algebra
Convert 0.75% to a decimal

pre-algebra
Linda would like to hire a clown to perform at her son's birthday party. Clown city charges $100 for incidentals plus $30 per hour for hiring a clown to perform. Party performers charges $120 for incidentals plus $25 per hour. How many hours would Linda need to plan on so...

pre-algebra
Sam has no more than $250 to spend on ceramic tile for his foyer. The rectangular floor in his foyer is 5ft. by 8ft. What can he spend per square foot on ceramic?

pre-algebra
Translate the following into an inequality. Do not solve. Profits in the second quarter for a local retailer were all 112% of that in the first quarter. Profits in the third quarter were 87% of that in the first quarter. The profits for the three quarterscombined exceeded $...

pre-algebra
Translate the following situation into an equation. Do not solve. There are seven less than twice the marbles in Tim's box as there are in Amelia's box. Chris has six more marbles than Amelia. How many marbles does Amelia have if together the three of them have 95 ...

pre-algebra
Angel M and Angel N are supplementary angles. If Angel M is nine more than one half Angel N, what are the measures of the angels?

pre-algebra
Use an inequality to solve the problem. The equation y=0.04x-0.40 can be used to determine the approximate profit,y, in dollars, of producing x items. How many items must be produced so the profit will be at least $1402?

pre-algebra
1/2*20<20 10x<20 x-2 The sign can be no more than 2 ft. high.

pre-algebra
Use an inequality to solve the problem. A shopkeeper is making a triangular sign for his store front, but he must keep the sign under 20 square feet to adhere to the zoning laws. If the base of the sign is 20 feet, what is the maximum height of the triangular sign?

Geometry
A cylinder has a height of 16 cm and a radius of 5 cm. A cone has a height of 12 cm and a radius of 4 cm. If the cone is placed inside the cylinder as shown, what is the volume of the air space surrounding the cone inside the cylinder? (Use 3.14 as an approximation of .)

spelling
boss'

science
two ways gravity can effect the movement of a wheel and axel in a bicycle

government
__________ is the term given to the activities of interest groups that seek to influence the making and implementation of public policy and to persuade government officials to support a group's position.

algebra
Rachael bought 12 pencils and 7 markers for $5.36, and later bought 8 pencils and 5 markers for $3.68. Find the cost of each pencil and marker.

math
In a pair of similar rectangles, the ratio of the widths Is 3:4. What is the ratio of the lengths?

math
parallel to y 2x+2 and passes through the point (2),(3)

english
in the story "snow" through the story's first-person narration, the reader comes to understand

trig
How do I find the exact value of sin2x when secx is equal to the negative square root of three

Math
Edit: (1/c+2) + (1/0.30c+0.60) = ?? How do i find a common denominator for this? thank you.

Math
1/c+2 + 1/0.30+0.60 = ?? How do i find a common denominator for this?

Math
1/7 + 1/-7 = How do i solve?

math
2/5

math
The perimeter of a rectagle is 50 centimeters. The length of the rectangle is one more than 3 times the width of the rectangle. What are the demensions of the rectangle?

Math
factor out 16x^2-80+100

English
Do you understand the ideals and values

Ap Euro History
What is the Relative Success in Achieving Catholic/Protestant Aims when the catholics posted the 95 theses?

Chemistry
Thanks much! I kept getting 0.4M, but realized that I was multiplying 1M * 10 mL instead of 0.1M.

Chemistry
Also, I was looking for the concentration of HCl, not the volume. The equation is: HCl (aq) + NH4OH (aq) ---> NH4Cl (aq) + H2O (l).

Chemistry
What is the concentration of HCl when 25.0 mL of HCl completely reacts with 10.0 mL of 0.1M solution of NH4OH (subscript 4)? Solution steps would be helpful so I can solve other similar problems.

Chemistry
convert @5g of NaCl into moles

chemistry
If I make an ice pack with 750mL of water, what mass of ammonium chloride must I include to get the temperature to drop from room temperature (20 degrees C) to 5 degrees C?

Calculus
______ /_____/| $5 bottom || || $1 Top || || H $3 Side ||____|| |/____|/S S A = S^2 * H Cost will be related 4 = S^2 * H with Surface Area H = 4 / S^2 So our equation is... SA = 2S^2 + 4SH Cost = 5S^2 + S^2 + 4*3*S(4/S^2) Cost = 6S^2 + 48/S Now we differentiate Cost Cost'...

math
Betty buys 16 balloond for her friend. At the rate given in the sign below how much does she pay in $ and cents A dozen ballons for $4.80

math
Betty buys 16 balloond for her friend. At the rate given in the sign below how much does she pay in $ and cents A dozen ballons for $4.80

physics
Two particles of mass m1 = 1.0 kg and m2 = 2.6 kg are traveling with velocities v1 = 4.9, and v2 = 2.5 as shown in the figure below. What is the total momentum of this system? Be sure to give the magnitude and direction of the momentum. magnitude 1 kg · m/s direction 2...

physics
Two particles of mass m1 = 1.0 kg and m2 = 2.6 kg are traveling with velocities v1 = 4.9, and v2 = 2.5 as shown in the figure below. What is the total momentum of this system? Be sure to give the magnitude and direction of the momentum. magnitude 1 kg · m/s direction 2&...

8th grade
I need a topic for a non fiction paper

science
what is the meaning of lysosmes. How is it used in a cell.

Math
56/9,644,600

math
looking for any mathematical characteristic of the number 13 for a math project

math
Show how commutative property of addition works using the numbers 2, 3, & 5

math
opps sorry 7+(3+5)=(7+3)+5

math
What property of addition is shown in the following number sentence? why?

math
What property of addition is shown by 5+2=2+5 Associative Distributive commutative or Identity

math
why is 23 deficient?

MATH
1273 256 1529 20 500 no

please check
1) exploit 2) obsolete 3)elicited 4) acclaim 5) escalated 6)engrossed 7)adjacent 8)terminate 9)methodical 10)tangible

Algebra
25b^3+5b^2+34b+29 go to webmathcom, click algebra and under simplifying expressions click anything else and enter your promblem and hit try to simplify it and it will explain everything

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