Answer:
Joe worked 3 hours overtime.
Step-by-step explanation:
Let t = number of hours overworked
425 + 20 × t = 485
425 + 20t = 485
20t = 485 - 425
= 60

t = 3
Joe worked 3 hours over time.
Hope this helps :)
Answer:
pairs
Step-by-step explanation:
Given
Profit on selling 'x' pairs of shoes is 
Find the derivative of the function to find out the critical points

Thus, for 4 pair of shoes profit is maximize.
Answer:
x=24
y=21
Step-by-step explanation:
ok budy mark me as brainlsit
Answer:
its really good luck for you know what is not my phone