Astore charges their customers based on the number of items that they buy. jane bought four items and was charged $15 and george bought twelve items and was charged $39. write a function to model the cost based on the number of items you buy. then determine how much you bought if you were charged $33.

f(x) = 3x + 3; f(22) = 69  is the answer

Use the two points given: (4, 15) and (12, 39)

Find the slope: m =  

Δy

Δx

=  

39 − 15

12 − 4

=  

24

8

= 3

Find the y-intercept: y = mx + b, y = 3x + b, 15 = 3(4) + b, 15 = 12 + b, 3 = b

Then substitute m and b into y= mx + b, y = 3x + 3 or f(x) = 3x + 3

Then evaluate, f(22) = 3(22) + 3 = 69

d 25 pi/6

step-by-step explanation:

the diameter is 10 inches

the radius is 1/2 of the diameter or 5 inches

the area of the circle is

a = pi r^2

  = pi 5^2

  = 25 pi

the slice is 60 degrees of the entire circle.

60 degrees out of 360   60/360 = 1/6

the area of the slice is 1/6 of the circle

a slice = 1/6 a circle

a slice = 1/6 * 25 pi

question 1: step-by-step explanation:

1/4 of 84 = 84÷4= 21