Find the sum and express it in simplest form. (-4a^3 - 6a^2) + (5a^3 + a^2 - 3)

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?

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5

What’s -11-33k and factor each expression completely