I need to know if I subtract or add and the answer. 12 points!

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Use the expression below.–4b + 8c + 12 – 8b – 2c + 6part asimplify the expression. enter your answers in the boxes. b + c + part bfactor the simplified expression using the gcf. a. 2(–2b + c + 3) b. 3(–2b + c + 3) c. 4(–2b + c + 3) d. 6(–2b + c + 3)part cwhat is the value of the expression when b = 2 and c = –3? enter your answer in the box.

Define multiplicative inverse. give an example of a number and its multiplicative inverse.