3. Write an equation and solve. Round to the nearest hundredth where necessary.
64 is 80% of what?
A 64. n=80; 0.8
B 0.64. n = 80; 125
C 80 = 64. n; 1.3
D 64 = 0.80 • n; 80

The answer is D. 64 = .80 * n; 80

Step-by-step explanation:

the word "is" in math means equal

the word "of" in math means multiply

So 64 is 80% of what? is saying 64 = 80%n

Let's turn 80% to a decimal, so that would equal 0.8

64 = .8n --> I used n because n is "what"

now you solve for n. Divide both sides by .8 and you get 80

about 0.75 hours

step-by-step explanation:

-3(b-8)-5=9(b+2)+1

distribute

-3b+24-5=9b+18+1

add/ subtract

-3b+20=9b+19

20-19= 1

-3b+1=9b

9b+3b= 12b

1=12b

1 divided by 12 = 1/12

answer: 1/12 = b