Please help if you can

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?

If np3 /nc2 = 6, find the value of n

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.