Whats the mid point of of a segment whose end points are (-8, 10) and (6, -12)?

Write the following as a base and exponent

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor