A 30-foot ladder was put up against a building. The ladder makes a 64° angle with the ground. How high up on the wall does the top of the ladder reach?

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.

When a number is decreased by 7%,the result is 74. what is the original number to the nearest tenth

If line segment ab measures approximately 8.6 units and is considered the base of parallelogram abcd, what is the apprlroximate corresponding height of the parallelogram?