Mathematics
milkystxrz:

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?

milkystxrz:

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

Mercury:

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

Mercury:

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

milkystxrz:

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?

Mercury:

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 = ?

milkystxrz:

ohhh its \$287.50 yea i accidentally added 40 twice

Mercury:

yup good

milkystxrz:

thanks you so much for your help :)