$10.20 plus 5% sales tax how much money

a): $10.71

b): $15.30

c): $0.51

d): $5.10

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?

What is the circumference of a circle with an area of 50.24 cm²?

Which expression is equivalent to 64 - 9x^2?