(F+G)^-1(x) of f(x)=2x and g(x)=x+1

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”?

What is the approximate value of  q  in the equation below? –1.613–1.5220.5853.079

Divide. –40 ÷ –5 a –8 b 200 c -200 d 8