PLease help me

What numbers are included in the set of integers? what numbers are not included?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?