Which ratio is equivalent to 4 : 13?
a. 8 : 17
b.16 : 52
c. 12 : 33
d. 20 : 55

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

If 20% of a number is 35, what is 50% of that number?

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2