What is r in this math question - 8=5.5-r

The astronomy club wants to buy five different eyepieces for a new telescope. The 6-, 12-, and 20-millimeter lenses cost $42.95 each, and the 32 - and 40-millimeter lenses cost $57.96 each.

Which expression is the best estimate of 1/5 times 24.5

How do you round any number?

Terrance is hiring a dog walker. One dog walker charges $2 per minute and a one-time charge of $30, while the other dog walker charges $5 per minute. For how many minutes do the dog walkers charge the same amount? A. 20 minutes B. 10 minutes C.

What is the number of possible combinations of 14 objects taken 3 at a time? A. 364 B. 1,001 C. 2,184 D. 24,024

Which of the following is equivalent to 7-2 (x + 2) <-4-3 (1 - x) ? A. - 2x<-17 B. 6 x <-9 C. - 5x<-10 D. - X<-16

Which phrases describe the graph of f (x) = |x|? Check all that apply. A. V-shaped B. U-shaped C. opens up D. opens down E. symmetric with respect to the x-axis F. symmetric with respect to the y-a

There are 36 female preformers in a dance recital. the ratio of men to women is 2:9 how many men are in the dance recital.

5x + 8=23 subtract 8 on both sides 8, 23 5x = 15 divide it on 5 x = 3

Linda drove 715 miles in 13 hours. At the same rate, how long would it take her to drive 495 miles?