5 - 10x + 15y - 20xy

What is the 90 confidence interval estimate of the mean if n is 45?

you find a rock containing a mixture of element and lead. you determine that 20% of the orignial element remain; the other 80% decayed into leads. how old is the rock?

A certain television is advertised as a 41-inch TV (the diagonal length). If the width of the TV is 40 inches, how many inches tall is the TV?

A man used 10 gallons of gasoline on a 180-mile trip. How many gallons of gasoline will he use on a 450-mile trip?

An above-ground circular swimming pool is 18 feet in diameter. How does the pool's diameter d compare to its circumference C? A: d=1/2C B: d=2C C: d=3C D: d=1/3C

A rectangle is twice as long as it is wide. it's area is 72 square units. Find the length of each side

Andrea built a circular barbecue pit with a circumference of 9 feet. She wants a rod to go across the pit to use for a rotisserie. The rod must go from one edge of the pit to the other, passing through its center.

How to find which cereal has the higher ratio of protein

Great a word problem for x+2=3x-8

21 is what percent less than 35?