Which is an example of a quadratic function whose graph opens downward and has its vertex at (0, 1)?
o a. y=-x2 + 1
o
b. y = x2 + x - 1
o
c. y = x2 + 4x + 1
o
d. y = x2 - 1

What is the interquartile range of this data set? 2, 5, 9, 11, 18, 30, 42, 48, 55, 73, 81

Qrst is a parallelogram. determine the measure of ∠q pls

Atest consists of 10 multiple choice questions, each with 5 possible answers, one of which is correct. to pass the test a student must get 60% or better on the test. if a student randomly guesses, what is the probability that the student will pass the test?