Bond Quotations - Wall Street Journal, May3, 2016
Bonds
Current Yield.
Vol.
Close
Net Change
AT&T 79250
200
113 5/8
-2 1/8
The current yield on this bond is:
A. 6.8%
B. 6.6%
C. 7.8%
D. 5.8%

what was there favorite food

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