How to calculate surface area of a donut shape, that is 1 inch wide, has a outer radius of 2.5 and a inner radius of 1.5

The perimeter of a rectangle is 68 cm. The length is 4 cm more than its width. Find the length of the rectangle.

How much higher is 500 than - 400

Liam is riding his bike at a rate of 7 miles per hour. He wants to beat his own one-day riding record. To do so, he has to ride more than 32 miles. He's already ridden 4 miles.

Shoshanna says that a triangle with side lengths 17m, 8m and 15m is not a right triangle because 17 squared plus 8 squared equals 353, 15 squared equals 225, and 353 does not equal 225. Is she correct? Explain.

Julie started with 20 pieces of gum and gave away X pieces Conrad started with 35 pieces of gum and gave away twice as many pieces as Julie did how many pieces of gum did Julie give away if they had the same number of pieces of gum?

find the total cost of a $55.00 dinner bill including 7% tax and 18% tip. how much change will you get back from $100.00

The number 4.124 has two 4s. Why does each 4 have a different value?

What is 3/10-2/5= Is it 1/2?

Solve for x 4x - 4 < 8

A zoo has 151515 Emperor penguins. The Emperor penguins make up 30%, percent of all the penguins at the zoo. How many penguins live at the zoo?