In the equations a=1/2bh, what does each of the variables stand for

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?

For the chance to be team captain, the numbers 1-30 are put in a hat and you get two chances to pick a number, without replacement. which formula correctly shows how to find the probability that you choose the number 1 and then 2?