What is the location of the point on the number line that is 2/5 of the way from a=-6 to b=9?

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25

What integer is equivalent to 9 3/2