3(3x-5) simplify the expression

What is the expression equivalent to (3x^2-7)

Lucinda leaves money in her savings account for 8 years. she started with $800 and earned 3.5% interest compound annually. how much money is in her account?

According to a survey by the beach lifeguards, there is a 25% chance that surfers will see a dolphin while surfing. which simulation could you use to answer questions about whether a surfer will see a dolphin?