Question

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Answer 1

First find the area of the circle piece of metal; then find the area of the hole; finally subtracted the area of the hole from the area of the circle piece of metal area, you will get the answer.

Answer 2

All right.

Answer 3

http://www4.pictures.zimbio.com/mp/Aw4TORRMYyFl.jpg

Answer 4

The area of the piece of circle metal is (x+5)^2pie; the area of the hole is (x+1)^2pie. So
(x+5)^2pie-(x+1)^2pie

=(x^2+25+10x)pie-(x^2+1+2x)pie

=pie(x^2+25+10x-x^2-1-2x)

=pie(24+8x)

=8piex+24pie

The first answer choice is right.

Answer 5

All right.

Answer 6

http://www4.pictures.zimbio.com/mp/Aw4TORRMYyFl.jpg

Answer 7

http://www.analyzemath.com/Geometry_calculators/ring_1.gif

Answer 8

First, pie(9x^2 + 48 + 64)/pie to get r^2.
6x^2+48+64 is r^2
6x^2+48+64
=6x^2+112
Now can you find the answer?

Answer 9

How do you get it?

Answer 10

\[\sqrt{6x^2+112}\]is the answer.