Simplify each expression. 1. -4 + 10 2. 6 - 8 3. -2 - 5 3(-4) 4.-20÷(-5) 5.-3(-8) 6.-18÷3

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

Acircle has a circumference of 7.850 units. what is its radius?

Tony is charged $ 50 and additional $0.15 per miles for renting a car. a) represent the cost of renting a car with an equation, and the determine the cost if he drove it70 miles. b) what would be the cost of a car rental if the car was driven 250 miles? show work