If you have ⅜ of one pie, what does the denominator tells you?

Use the data on the dot plot to answer the question.how many people read for more than three hours last week? i'm on a unit test review

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?