两道函数数学题（英文）The weight of a body above sea level varies inver

The weight of a body above sea level varies inversely with the square of the distance from the center of Earth. IF a woman weighs 116 pounds when she is at sea level, 3960 miles from the center of Earth, how much will she weigh when she is at the top of a mountain, 3.5 miles above sea level?

The horsepower that a shaft can safely transmit varies jointly with its speed(in revolutions per minute, rpm) and the cube of its diameter. if a shaft of a certain material 2 inches in diameter can transmit 36hp at 75 rpm, what diameter must the shaft have in order to transmit 10hp at 200 rpm?