If the following equation is true, what could be the value of x ? 2(x+1) = 8^2

a. 2
b. 3
c. 4
d. 5

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The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Solve this problem! extra ! 3025/5.5 = a/90.75