If f(x) = 2x2-3x, what is the value of f(5)?

2-digit numbers less than 91 which are 1 less than a multiple of 10

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?

What expression is equivalent to (2x-1)(x-3)?