Polynomial Functions Unit Test Item 7
The reflector of a flashlight is in the shape of a parabolic surface. The reflections of all rays from the light bulb to any point on
the parabolic surface will all be parallel to each other. The casting has a diameter of 16 centimeters and a depth of 8
centimeters. Find the focus to determine how far the light bulb should be placed from the vertex (1 point)
Item 8
Item 9
Item 10
The light bulb should be placed
centimeter(s) from the vertex
al
Item 11
Item 12
Item 13
Item 14
Item 15
ot
Item 16

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.

really really sorry if i'm

-12 -5(x + 4) = 3x

-12 - 5x - 20 = 3x

-12 - 20 - 5x = 3x

-32 - 5x = 3x

    + 5x   + 5x

-32 = 8x

8         8

- 4= x

well if he bought them at 5 cedis each sold them at 7 cedis each then he would make a profit of 2 cedis of each book. if in total he made 150 cedis profit that means he sold 75 books. he lost 12 books at the start so that means he originally bought a total of 82 books.

step-by-step explanation: