X=1/27 decimal form=0.037 repeating
X=-3 because 5x-3=-15, -15-7 =-22
<span>Generally according to mathematical formulas the standard deviation is defined as the square root of the variance.Same formula applied to this question where variance is 100 which results that standard deviation is 10.Whereas variance is the square of the standard deviation which is 100 derived in the question.</span>
Answer:
20 its 60 dollars
Step-by-step explanation: