Calculate the sum 24 + (-9)

How do you write 13/25 as a percentage

Roger has 6 gallons of milk. He uses 1/2 of it to make hot chocolate and 2/3 remaining milk to make cookies. How many gallons of milk does Roger have left after making hot chocolate and cookies?

Write 4 13/20 as a decimal.

What is the discriminant D of the equation? a2-2a+5=0 Enter your answer in the box.

The difference between one-third of a number and 11 is 10.

In a family with 7 children, excluding multiple births, what is the probability of having exactly 2 girls? Assume that having a boy is as likely as having a girl at each birth.

A baseball player hit 65 home runs in a season. Of the 65 home runs, 19 went to right field, 23 went to right-center field, 9 went to center field, 11 went to left-center field, and 3 went to left field.

How many milliliters of olive oil (D=0.92 g/mL) have the same mass as 1.80 L of gasoline (D=.74 g/mL)

Leo's family keeps recyclables in a cylindrical trash can. Today Leo bought a larger can with a radius and height that are twice the radius and height of the old can. Leo claims the new and old cans are geometrically similar figures.

The value of Maggie's car decreased by 30% since last year, when she bought it. If the car is now worth $17,000.00, how much was the car worth when she bought it?