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

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb

think the answer is 30 degrees. if not than it is 20 degrees. not 100% sure. let me know if it was right.

gill russ