Between $4.40 for 20 oz of cereal and $3.68 for 16 oz of the sane brand eitch is the better buy

Simplify this expression.2(10) + 2(x – 4) a. 2x + 16 b. x + 12 c. 2x + 12 d. x + 16

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?