Why does 30+(-8)+(-6) equal 16? i'm so confused on this one

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.

How do i multiply two digit numbers

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