The vertex of this parabola is at (-5, 4). Which of the following could be its equation?
10
(-5,4)
10
10
O A. y = -(x + 5)2 + 4
O B. y= -(x - 5)2-4
O c. y = -(x + 5)2 - 4
O D. y=-(x - 5)2 + 4

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?

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

Which expression is rational? 6. , square root two, square root 14, square root 49