Evaluate 2a - 3b for a = 6 and b = -3. 21 3 -7

Your friend swims on the school team. in his first four races, his times are 24.7, 23.5, 25.6, and 27.2 seconds. which time listed for his next race would make the range larger?

For a field trip to the zoo, 4 students rode in cars and the rest filled nine busess. how many students were in each bus if 472 students were on the trip

Solve the system of equations y= 3/2 - 1, -x+ y =-3