In any parallelogram ABCD, it is always true that the measures of angleABC and angleBCD: F. Add up to 180 degrees
G. Add up to 90 degrees
H. Are greater than 90 degrees
J. Are each 90 degrees
K. Are each less than 90 degrees.

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.