Tiffany sells musical instruments and equipment at Let It Rock in the mall. She earns a commission of 5% on the first $6,000, 7.5% on the next $6,000, and 10% on sales over $12,000. Her total sales for the month are $14,640. What is Tiffany’s total commission?

$800

Step-by-step explanation:

5% × 6000 = $350

14640 - 6000 = $8640

7.5% × 6000 = $450

8640 - 6000 = $2640

350 + 450 = $800

the line of

step-by-step explanation:

let

we know that

the y-intercept is the y-coordinate of the point when the value of x is equal to zero

so

the y-coordinate of the point a is the y-intercept

the answer part a) is

the value of y-intercept is

part b) find the slope m

we know that

the value of the slope is equal to

substitute the values

therefore

the answer part b) is

the value of the slope is equal to

the general answer is

the slope is

the value of y-intercept is