Geometry 70 points ! find surface area. it’s okay if you did one but i would prefer if you did both

Peter measures the angles in a triangle. he finds that the angles are 95, 10 and 75. is he correct? explain your answer

Interpret the following expression (5y^2-7)^3/(2y)^2

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