A number decreased by 15 is the same as 3 times as much as the number increased by
1.

-4

Step-by-step explanation:

We create an equation like this n-15=3n+1

We need to subtract 3n on both sides to get -4n-15=1

Next, we need to add 15 on both sides to get -4n=16

Divide 4 on both sides to get -4.

the answer is 8/21

hope this

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