Question

Corinne has a job selling magazines. She earns $7.50 per hour plus 20% of the total amount of her sales. She also gets an allowance of $40 per week for gas. She knows her weekly earnings can be shown using the following expression:

7.50h + 0.20s + 40

Part A: Identify a coefficient, a variable, and a constant in this expression.

Part B: If Corinne works for 25 hours and sells $300 in magazines, how much does she earn for the week? Show your work to receive full credit.

Part C: If Corinne gets a raise and begins earning $9 per hour, would the coefficient, variable, or constant in the equation change? Why?

Answer 1

i know it looks like a lot but i kinda need help with Part B and Part C please :(

Answer 2

let's look at this equation and make sure we understand what it means

7.50h + 0.20s + 40

her hourly wage is $7.50. since 7.50 is being multiplied to h, then h is the # of hours worked

same logic with sales. she gets 20% of sales, so since 0.20 is being multiplied to s, then s is the amount she makes in sales

Answer 3

therefore, for part B), h = 25 hours and s = 300

plug these into the equation 7.50h + 0.20s + 40 and solve

for part C) her new hourly rate is 9 dollars. this will replace her old hourly rate, 7.50. is 7.50 a coefficient, variable, or constant? as a reminder, it's being multiplied to h

Answer 4

Ok so for Part B) I got $327.50 is that correct?

And for Part C) 7.50 is a coefficient, so 9 would change to be the new coefficient

I'm pretty sure im correct with these but can you make sure?

Answer 5

part C is good

check your calculations for B again
7.50h + 0.20s + 40
plugging things in...
7.50(25) + 0.20(300) + 40 = ?

Answer 6

ohhh its $287.50

yea i accidentally added 40 twice

Answer 7

yup good

Answer 8

thanks you so much for your help :)