Answer:
6 inches
Step-by-step explanation:
Formula for surface area of a cylinder:

Plug in values and solve for the radius:

Divide both sides by 

Subtract 90 from both sides

Use the quadratic equation to find the roots
±
(sorry for formatting, Brainly doesn't
allow equations with ± in them)
and 
and 
and 
and 
and 
and
We can't have a negative radius, so that leaves us with r=6 in.
Pythagorean theorem:
a^2+b^2=c^2 (C^2 always is the hypotenuse)
21^2+b^2=29^2
441+b^2=841
841-441=400
square root of 400 is 20
Your answer is 20
The points have to have the coordinate y=4 to be on the y=4 line
only the (1, 4) point matches this, so yes it is a solution, all others not and are therefore no
Answer: 42
Step-by-step explanation:
-14 1/9 would round to -14
-2 9/10 would round to -3
-14 x -3= 42