In hillcrest school, 36% of middle school students are in grade 6, 31% are in grade 7, and 33% are in grade 8. if a middle school student is selected randomly, what is the probability that the student is either in grade 6 or in grade 7? a) 0.31 b) 0.33 c) 0.64 d) 0.67

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

It says factor each expression completely 8y+48

Use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the curves about the given axis.y = 7ex, y = 7e^-x, x = 1; about the y-axis