5m + 10 = 15 this is my math but i don't feel like doing it so can anyone do the work lol

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

Which statements regarding efg are true? check all that apply.

Ahypothesis is: a the average squared deviations about the mean of a distribution of values b) an empirically testable statement that is an unproven supposition developed in order to explain phenomena a statement that asserts the status quo; that is, any change from what has been c) thought to be true is due to random sampling order da statement that is the opposite of the null hypothesis e) the error made by rejecting the null hypothesis when it is true