The cities Gardenville, Jamestown; and River City, in respective order, lie approximately in a straight line. The distance from Gardenville to Jamestown is 76 miles. The distance from Gardenville to River City is 159 miles. Find the distance from Jamestown to River City.

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

step by step explanation: when u removing the parentheses and combined them that would be : x+3y-x-y=2y