I’m having problems solving this problem

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

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

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?