An expression using a base and an exponent what is the word for this definition you

It takes evan 6 3/4 to mow 3 lawns. it takes 2 1/3 hours to mow me. gals lawn and 1 3/4 hot mow ms. lee’s lawn. how many hours does it take evan to mow the third lawn?

What is 32+4 x (16 x 1/2) -2 show your work}

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