Plz help me 50points plzzz help me

the answer will be

area is= 10

maximum area is 100

Step-by-step explanation:

hello,

to find the area of the figure:

A = b x h

b = w ; h = 20-w

A = w(20-w)

A = 20w - w^2  OR  A = -w^2+20w

to find the maximum w value:

so this equation when graphed would make a parabola. the maximum area is found using the vertex of the parabola.

you can graph it to find the vertex or the vertex can be found with the formula -b/2a

our b is 20 and our a is -1

-b/2a = -20/2(-1) = 10

10 is the w value

to find the area we substitute all the w's in the equation for 10

A = 20w-w^2

A = 20(10) - (10)^2

A = 200 - 100

A = 100

so to sum up:

the equation for the area is A = 20w - w^2  OR  A = -w^2+20w (whichever one should work)

the maxiumum area is 100 square units

hope this helped :)

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

ddd

step-by-step explanation: