There are 30 students in a year 10 maths class. in the latest test the 21 girls in the class score a mean of 61%. in the same test the 9 boys in the class scored a mean of 78%. calculate the mean for the whole group of students.

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

Which graph depicts the path of a projectile