Can you me out here. im sure how to mark brainiest because it doesnt give me a button. but ill mark 5 stars and give . i suppose not sure what that means on here.

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16

Anormally distributed data set has a mean of 176.3 and a standard deviation of 4.2. what is the approximate z-score for the data value of 167.9? 2.00 −2.00 8.4 −8.4