A rectangle's length is 4 more than twice its width. Its area is 240 square centimeters.
Complete the work to find the dimensions of the
rectangle.
w(2w + 4) = 240
2w2 + 4w = 240
2w2 + 4w - 240 = 0
2(w + 12)(w - 10) = 0
What is the width of the rectangle?
2w + 4 A = 240 cm2
What is the length of the rectangle?
w

Step-by-step explanation:

width = w

Length = 2w + 4

Area = 240 sq. cm

length * width = 240

(2w + 4) * w = 240

2w *w + 4*w = 240

2w² + 4w = 240

2w² + 4w -240  = 0

2(w²+2w - 120) = 0

2(w² + 12w - 10w - 10*12)=0

2 (w[w + 12] - 10[w + 12] ) = 0

2 (w + 12) (w-10) = 0

Ignore (w + 12) because measurement wont be in negative value

w - 10 = 0

w = 10

Width = 10 cm

length = 2w + 4 = 2*10 + 4 = 20 + 4

Length = 24 cm

Width = 10

Length = 24

Step-by-step explanation:

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1

for this pair of functions g(x)=x-2 and f(x)=|x| is (g o f)(a)= |a| -2

step-by-step explanation:

g(x)=x-2

f(x)=|x|

(g o f)(a)=?

(g o f)(x)=g(f(x))

(g o f)(x)=g(|x|)

(g o f)(x)=|x|-2

(g o f)(a)=|a|-2