Six times the sum of a number 2 is equal to 8

For the function, f(x) = -5x 2, find f(-4).

How can we find the measure of an exterior angle if we know the measurement of an interior angle

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?