For a sample with M=72 and s=4, what is the X value corresponding to z= -2.00 fórmulas:

z= X-M/s
X=M+zs

the answer is 64, i just can’t seem to get to that answer.

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

Pls will give brainliest and all p. s u can zoom in if u cant see plss

The jewelry store is having a sale. necklaces that were regularly priced at $23.50 are on sale for $18.80. what is the percentage of decrease in the price of necklaces?