Anyone know how to do this u dont have to say the answer I just dont get it

1. 7

Step-by-step explanation:

The first 4 problems require you to know how to use the square root. Essentially, you want to find the number that times itself will equal the number in your square root. So, for the first problem, for some number x,  x*x=49. Thus, x=7 and that is your answer. I will continue the first 4...just typing

The diameter is twice that, or approx. 7.90 units.

Step-by-step explanation:

the equation for the volume of a cylinder of radius r and height h is

V = πr²h.  Here we need to calculate the diameter after having found the radius.  Solving V = πr²h for r², we get:

           V

r² =

         πh

Substituting the given values, we obtain for r² the following:

         145 units³

r² =  = 15.6 units²

       3.14159(5 units)

Taking the square root of both sides, we get:

r = √15.60, or approx. 3.95 units.

The diameter is twice that, or approx. 7.90 units.