the cost of a limited edition baseball card increases from $20 to $40. What percent did the price increase by?

What is the surface area of a triangular pyramid if each face has an area of 80 m2? A. 240 m2 B. 160 m2 C. 320 m2 D. 20 m2

The cost of fuel to propel a boat through the water (in dollars per hour) is proportional to the cube of the speed v. a certain ferry boat uses $100 worth of fuel per hour when cruising at 10 miles per hour.

What is the slope of the line? 3x-4y=7

The triangles are similar. If DE=32, EF=24, and BC=6, find AB

5. (9x - 8) - (x + 4) =

How many 15 inch steel rods can you cut from the 20 - foot rod

A student has two square pyramids. The second square pyramid has base side lengths that are twice that of the first pyramid. The formula for the volume V of a pyramid with base area B and height h is V = 13Bh.

Balloon arrangements are being made for a party. There are 35 white balloons and 45 purple balloons. Each arrangement must be identical. What is the greatest number of arrangements that can be made using every balloon?

Leah is placing books on a one meter long shelf. If each book is 2 cm wide, how many books will fit on the shelf?

Rex mixed x liters of fruit syrup with y liters of water to make a fruit punch. Three times the number of liters of water he mixed was 6 more than twice the number of liters of syrup he mixed.