Simplify each sum or difference

(5r^3+8) + (6r^3+3)

Find the surface area of this prism. Leave your answer as a mixed number in simplest form.

A cylinder has a diameter of 5.8 cm and is 8.4 cm high. Calculate the volume of the cylinder.

Get the message. Math puzzle

Tricia wants to create a path using pebbles. She has 8 bags of pebbles and each bag covers an area of about 6 square feet. If she wants to make the path 2 feet wide, about how long can she make the path?

A circle is divided into 5 equal parts what is the total angle measure of 4 parts

What is the answer to this question because i don't know9N-4=

3x-3=x-4 Can someone show me the steps for this?

7/6 - (1/4 + 1/3) = ?

A rectangular prism has the length of 11 centimeters, a width of 9 centimeters, and a height of 3 centimeters

Express using a radical 3 1/2