On a unit test in a statistics class, the teacher determines that the mean test grade was 77.5 with a standard deviation of 5.2. One student’s test grade was 91. What is the z-score for the student’s test? –5.20
–2.60
2.60
5.20

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.

Somone me i want to know what 18 hours out of 24 hours in a fraction