x2 -2(x-3) Substitute x=3 32 - 2(3-3) = 9 - 0 = 9

x2 -2(x-3) Substitute x=3 32 - 2(3-3) = 9 - 0 = 9

What does an espresso cost (answer)

Let e = cost of the espresso and b = cost of the biscotti Set up a series of 2 equations in 2 variables based on the information given: 2e + b = 4.40 e +2b = 3.55 And solve using either substitution or elimination

Let w = width, then the length l = 2xw (twice the width) Perimeter = 2w + 2l = 2w + 2(2w) = 96 and solve for w 6w = 96 w = 16, l = 32

There are only 64 squares on a chess board, so 263, since the first square is 20, = 92,233,720,368,554,775,808 grains of wheat.

Hello helpe me please (answer)

Let x = # dimes, then 24-x = # of quarters 10(x) + 25(24-x) = 435 and solve for x 10x + 600 - 25x = 435 -15x = -165 x = 11 = dimes, 13 quarters

Let x = volume of the 30% solution, then 10-x = volume of the 18% solution. set up the following equation: .3x + .18(10-x) = 10(.27) and solve for x .12x + 1.8 = 2.7 .12x = .9 x = 7.5

The probability of winning at least 1 game is equal to 1- P(winning zero games). The probability of winning zero games is (19/20)5 = .774, so the odds of winning at leat 1 game is 1-.774 = .226

z = kx2/y2 to solve for k substitute the initial values of x , y and z and solve for k 142 = 16k/25 k = 221.875 z = (221.875)(100/36) = 616.32

y=2x+3; y=4x-1 (answer)

Since y = y, 2x+3 = 4x - 1 2x = 4 x = 2, substitute it in and y =7

How many cubes with edge lengths of 1/2 could fit in a rectangular prism with a volume of 2646? (answer)

The volume of the cube is 1/2 x 1/2 x 1/2 = 1/8 2646/(1/8) = 21168

Let b-speed of boat and c=speed of current. Set up a system of 2 equations in 2 variables: 30 = 5(b-c) travelling against the current or 30 = 5b - 5c 30 = 3(b+c) travelling with the current or 30 - 3b + 3c And solve using either elimination...

The probability of the first being black is 6/14 (desired/total). the 2nd is 5/13 (since 1 black marble is gone and the 3rd is 4/12. Multiplying the three together gives us the total probability: 6/14 x 5/13 x 4/12 = 5/91

Need more info. There is no question here.

When three times a number is decreased by five the square root of the result is 7. Find the number (answer)

sqrt(3x-5) = 7 3x - 5 = 49 3x = 54 x = 18

A=1/2*b*h = 1/2*4.8*5.2 = 12.48 m2

30(3.28)=98.4 ft

First you need to figure out what each column/row is equal to. Add all the number and divide by 3 = 0 Then set up your square -12 0 12 9 -6 -3 3 6 -9 &nbs...

-5a√(12a3b4c) = -5a(2ab2)√(3ac) = -10a2b2√(3ac)

what dimensions should be used to make the gardens, and what will the largest area possible be? (answer)

Let x = length, which is also the shared side. The width will be (200-3x)/4. Area = (l x w) A = x(200-3x/4) A = 50x - 3x2/4 take the first derivative, set = zero and solve for x 50-3x/2 = 0 x = 100/3

A = (pi)r2 = (3.14)(9)2 = 254.34 km2