Rosa's test scores are 78, 92, 88, and 89. what must she score on her next test to have an average of 90? a) 95 b) 97 c) 99 d) 103

D

Step-by-step explanation:

Let x represent the score on her next test

78 + 92 + 88 + 89 + x = 5(90)

                      347 + x = 450

                    -347         -347

                                x = 103

your answer is the last one

step-by-step explanation:

divide the length of a'c' by the length of ac to get a scale factor of two

& then reflect vertically (over the y-axis)

so your answer is dilation by a scale factor of 2 followed by reflection over the y-axis