The teacher of a class that contains 12 boys and 16 girls needs to pick two volunteers. She randomly selects one student, then another student from the class. Find the probability that a) she chose one boy then one girl. b) she chose one boy and then another boy.

Clarence wants to buy a new car. he finds an ad for a car that costs 27,200 dollars. suppose his local sales tax is 7%. -how much would he have to pay? -what is the cost of the car including tax? -if clarence has 29,864 saved, can he pay cash to buy the car?

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2