Do integers have to be a set of positive and negative numbers?

Patrick saved $500. Her received 25% of the money for his birthday, saved 30% of the remainder from his allowence, and earned the rest of it by mowing lawns. How much of his savings did he earn by mowing lawns?

If Lin wants to save 75$ for a trip to the city and has already saved 37.50 so far what percentage of her goal has she saved

An engineering school reports that 52% of its students are male (M), 33% of its students are between the ages of 18 and 20 (A), and that 27% are both male and between the ages of 18 and 20.

A number between 61-107 and are multiples of 3,8,12

5x=2x-15 y=2x-15 and y=5x

The measure of an angle is 28 greater than its complement. Find the measure of each angle.

Round 2.41 to the nearest whole number

How would I write 8 centimeters as a fraction

In training for the zombie race, Harris runs 4 times back and forth across the pasture, then runs through the woods 3.75 miles. In all, Harris runs 15.7 miles. What is the distance from one side of the pasture to the other?

What's the probability of P (T) ?