A recent survey determined the percentage of high school students who send more than 30 text messages each day. The results are shown on the table. A number identifies each high school that participated in the survey. To the nearest hundredth, what is the mean of the data?

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step-by-step explanation:

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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

if you're trying to figure out how much each ounce cost it would be 0.20

cents each ounce