Someone please help me make an equation for the first question! :)

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

Use the frequency distribution, which shows the number of american voters (in millions) according to age, to find the probability that a voter chosen at random is in the 18 to 20 years old age range. ages frequency 18 to 20 5.9 21 to 24 7.7 25 to 34 20.4 35 to 44 25.1 45 to 64 54.4 65 and over 27.7 the probability that a voter chosen at random is in the 18 to 20 years old age range is nothing. (round to three decimal places as needed.)

If the class was going to get a class pet and 5 picked fish and 7 pick bird and 8 picked rabbits have many students were in the