Which of the following is equivalent to 18 sqrt -25

a: 5i
b: 18-5i
c: 18+5i
d: 23

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?

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

If you double the input of a function and it results in half the output, and if you triple the input and it results in a third of the output, what can be guessed about the function? check all that apply.