Answer:
I don't understand the question?
The answer is 16.099.
pls mark mark me as brainnest
First, note that x+21 and 3x+9 are "complementary angles;" they add up to 90 degrees. Thus, 4x + 30 = 90 degrees, so that 4x = 60 degrees, and x = 15 degrees.
95% of scores fall within +/-2 standard deviations from the mean
