PLEASE HELP I DONT UNDERSTAND THIS QUESTION!

3(10x-y)-5(x-y^2) need this solved asap

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

]supplementary angles are two angles that add up to . • complementary angles are two angles that add up to degrees. • adjacent angles share a and a • congruent angles have the measure. • an triangle has one angle that is greater than 90 degrees. • a triangle with angles 45°, 45°, and 90° would be a triangle