Combine like terms to simplify the expression:
1.17 - 0.07a + (-3.92a)

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?

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

When steve woke up. his temperature was 102 degrees f. two hours later it was 3 degrees lower. what was his temperature then?