Add or subtract, simplify completely

A cylinder shaped can needs to be constructed to hold 600 cubic centimeters of soup. The material for the sides of the can costs 0.03 cents per square centimeter. The material for the top and bottom of the can need to be thicker, and costs 0.

A parallelogram has base 20 cm and height 9 cm. What is its area?

Find the difference between 8/15and - 2/3. Show all calculations in your final answer.

4x+y-3z=45 6x-4y+3z=41 2x-7y-11z=85

What number times itself to be 49

What Percent of 250 is 70? a) 3.6% b) 18% c) 28% d) 175% can someone explain how u got the answer?

What is the square root of 81 and multiplied that by 2?

An elementary school received a donation of $1,000. The school has 4 kindergarten classes and 3 classes each in grades 1 through 6. Can the money be divided equally among the classes?

What is the greatest common factor between 120 and 88?

What is the volume of a right circular cylinder with a radius of 5 cm and a height of 12 cm? 60pi cm^3 120pi cm^3 300pi cm^3 1200pi cm^3