You dive 21 feet from the surface of a lake in 7 seconds .
a. what is the mean change .
b. you continue diving what is your position relative to the surface after 5 more seconds

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

Asquare is dilated by a scale factor of 1.25 to create a new square. how does the area of the new square compare with the area of the original square? a)the area of the new square is 1.25 times the area of the original square. b)the area of the new square is 2.50 times the area of the original square. c)the area of the new square is 1.252 times the area of the original square. d)the area of the new square is 1.253 times the area of the original square.

Find the domain of the following expression: 1/(√x)-2