The average height of 3 boys is 130 cm. If the shortest boy is 120 cm tall, how tall could the tallest boy be? (BTW average = Mean) fast please!!

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?

What is the distance from zero if a quadratic function has a line of symmetry at x=-3 and a zero at 4