How do I Simplify (5^2)^3 in algebra

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

Plzzz answer both questions and i will give you 100 points

Hassan bought a package of tofu. the temperature of the tofu was 14° celsius when hassan put the package into the freezer. he left the tofu in the freezer until it reached –19° celsius. which expressions explain how to find the change in temperature, in degrees celsius, of the package of tofu? select three that apply.