Find the missing number in the following series:

4? 17 51 56 168 i know the answer is 12 (someone else said) but i don't know why. Can anyone explain the pattern?

Evaluate the expression s + 35/7+2

Four days before the day after tomorrow is a Wednesday. What day of the week was it 13 days before yesterday?

Length of a tennis court:26yd length of a table tennis table:9ft what would be the ratio

Given equations A and B as 2/5x+y=12 and 5/2y-x=6, respectively, which expression will eliminate the variable x?

What will it cost to tile a rectangular floor measuring 299 feet by 34 feet if the tile costs $11 per square foot?

If x is to be chosen at random from the set {1,2,3,4} and y is to be chosen at random from the set {5,6,7}, what is the probability that xy will be even?

What is the surface area of 20in 7in and 15in

Square root 102 to the nearest tenths

A manufacturer inspects 800 personal video players and finds that 796 of them have no defects. What is the experimental probability that a video player chosen at random has no defects? Express your answer as a percentage.

Dagne measures and finds that she can do a vertical jump that is 27.5% of her height. If Dagne is 48 inches tall, how high can she jump?