In addition to an $80 bonus joan earned eight dollars per hour working last week joans total earnings last week or $240 how many total hours did she work last week

20 hours

hope it helps

Step-by-step explanation:

total earnings was $240 but to find how much he made working you first have to deduct the $80 bonus  

240 - 80 = 160

so he made $160 working now to find out how many hours worked you have to divide by 8 because he got paid $8.00 an hour

160 ÷ 8 = 20

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50