What is the least common denominator of 1/3 and 5/6

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

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.

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)