300/60=5 so your answer is 5 hours
4(9+7) = 36+28 = 64
open the parentheses, then simplify.
One could be |x|<-2
This could be one since no matter what you put in for x, it will always be positive.
There are 13 girls and 4 more students that are boys that made an A grade. Thus there are 13+4=17 students that are either girls or A students.
The probability of choosing a girl or A student is 17/30.