In a science contest, 30 students will present their science projects. Each student gets to talk for 20 minutes. How much time is needed
to present all of the science projects?

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

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|