Select two ratios that are equivalent to 2: 9.
choose 2 answers:
(choice a)
9: 2
(choice b)
18: 81
(choice c)
12: 54
(choice d)
18: 4
(choice e)
20: 45

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

What is the total surface area of this square pyramid?