For what value of xis the rational expression below equal to zero? X-9
(x-4)(x + 4)
O A. 9
B. -9
O C. -4
D. 4

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

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.