The histogram shows the ages of cars sold at an auction. What percent of the cars were less than 19 years old or more than 50 years old.

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it. how many multiple-choice questions are on the test?

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.