10/27/12

A student's grade in a course is the

A student's grade in a course is the average of 4 test grades and a final exam that is worth twice as much as each test. Suppose a student has test grades of 91, 82, 83, and 92. Write an equation... more

solve proportion

-4/9=3/n  __/(decimal)

10/26/12

what symbol u can put instead of the questions mark, with the SAME symbol?......(5?5+5?5=11)SAME SYMBOL!!!

this is a pre-algebra math problem, but i have no idea how to do it.... so how can u get 11, with 4 fives, same symbol sign instead of the ?marks, and there's a + sign in between.... 5?5+5?=11

10/26/12

square root of 60

square root of 60

10/26/12

chiara has 3 balls more than francesca. marco has 7balls more than chiara. if there are 46 balls how many each of them?

chiara has 3 balls more than francesca. marco has 7balls more than chiara. if there are 46 balls how many each of them?

10/26/12

what is the volume in milliliters of 0.0100 mol of CH(subscript4) gas at STP?

could not figure out how to add the 4 subscript for CH

10/26/12

Y=XSIN(PI X)Y'=SIN(PI X)+ PI XCOS(PI X)I don't know who to solve for the critical numbers because I don't know how to factor this.Thanks!

With other problems such as Y= 2X^3 + 3X^2, I can easily factor the deriviate: Y'= 6X^2 + 6X and set it equal to zero.  With the trig derivative, I don't know how to finish the problem.

10/26/12

find x for randon variables 4 probability .10, 6 pis .60 and 8 probabiltiy .30 compute the mean and expected value

P stands for for probabiltiy for each number 4, 6, 8 computr the mean and the expected value

If x, y, and z are positive integers such that the value of.... PLEASE HELP

If x,y, and z are positive integers such that the value of x+y is even and the value of (x+y)^2 (squared)+x+z is odd, which of the following must be true? a) x is odd b) x is even c) If z is... more

If k,n, and r are integers, let k... PLEASE HELP!

If k,n, and r are integers, let k^(n,r) be defines to be true onlu if n<k<r. If -2^(n,0) is true, which of the following could be a possible value of n? I. -3, II. -1, III. 3 a) I only b)... more

SAT Prep Math Queston!! PLEASE HELP

A regulation for riding a certain amusement park ride requires that a child be between 30 inches and 50 inches tall. Which of the following inequalities can be used to determine whether or not a... more

10/25/12

(X-2)/3+(X-2)/4=7/24

PLEASE SHOW ME THE STEPS TO SOLVE THIS EQUATION. I KNOW THE ANSWER IS X=5/2

comgining like terms. what do these mean,11b -6 6v 5a 5c 6 -5b 2b what do or how do i use them..

comgining like terms. what do these mean,11b -6 6v 5a 5c 6 -5b 2b what do or how do i use them..

which ordered pairs are solutions of each equation?(circle them)

3x+3y=0 A.(1,-1)      B.(2,4)      C.(-1,1)      D.(-2,2)

which ordered pairs are solutions to each equation?(circle them)

x-3y=-7  A.(2,-1)      B.(2,4)       C.(-1,2)       D.(2,3)

which ordered pairs are solutions of each questions?(circle them)

y=3x A.(6,2)          B.(-2,-6)       C.(0,0)         D.(-15,-5)     

determine the slope and y-intercept of each line then graph it

2x+3y=6                  m=___________       b=__________

determine the slope and y-intercept of each line then graph it

3y=2x+3              m=__________       b=__________

determine the slopeand y-intercept of each line then graph it

2x-y=-3                  m=__________        b=_________

determine the slope and y-intercept of each line then graph it

3x+y=-2               m=_______       b=_________

10/25/12

how do you get y by itself:h*x+k*y=20

PLEASE HELP\ how do you get y by itself:h*x+k*y=20

10/25/12

5x - 8a + 4a - 2x + a

5x - 8a + 4a - 2x + a

10/25/12

what is the answer to 53/7:7

This is my little brothers math problem he had for homework last night. How do you do this?

10/25/12

Evolution theory is 100% right ?

Evolution theory stated that random changes and the natural selection process create new species. What are some examples of random changes that have been (or being) filtered out by natural... more

10/25/12

does from mean subtract

Victor is building a set of stairs. The board he is cutting to make the steps is 12 ft long. Each step is 3 1/2 feet long. How many complete steps can he make from th 12 ft board? Does the word... more

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