Question

12d2 + 4d – 1
A. (6d + 1)(2d + 1)

B. (6d – 1)(2d – 1)

C. (6d – 1)(2d + 1)

D. (6d + 1)(2d – 1)
I think it is D

Answer 1

no it's not D

Answer 2

Am I correct?

Answer 3

is it C

Answer 4

good you got it

Answer 5

thanks can you help me with one more please?

Answer 6

sure

Answer 7

A machinist creates a washer by drilling a hole through the center of a circular piece of metal. If the piece of metal has a radius of x + 10 and the hole has a radius of x + 6, what is the area of the washer?
A.


B.

C.

D.

Answer 8

Area of washer = Area of metal - Area of drilled out hole

btw, your answer choices are blank

Answer 9

i noticed

Answer 10

12d2+4d-1
12d2+6d-2d-1
6d(2d+1)-1(2d+1)
(6d-1)(2d+1)

Answer 11

x^2-8piex-64pie
x^2+8piex-64pie
8piex-64pie
8piex+64pie

Answer 12

these are the answers

Answer 13

Use the idea that

A = pi*r^2

and plug in r = x+10 to find the area of the metal disk (the largest disk)

Then plug in r = x+6 to find the area of the drilled out hole.

Afterwards, subtract the two.

Answer 14

so my is answer is going to be B. x^2+8piex-64pie

Answer 15

what is (x+10)^2?

Answer 16

100

Answer 17

(x+10)^2

(x+10)(x+10)

x(x+10)+10(x+10)

x^2+10x+10x+100

x^2+20x+100


So (x+10)^2 = x^2+20x+100

Answer 18

is the answer B.

Answer 19

no

Answer 20

then the answer has to be C then

Answer 21

no

Answer 22

a

Answer 23

still no