How do i do this, please explain.

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Which equation represents h for right triangle abc

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected