Somebody please help me?

( I'm new to this)

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.)

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

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.