91. a service organization is recruiting volunteers for a clean-up day. at the previous event. 171 of the
180 people who signed up in advance came to the event,
a estimate the probability that a person who signs up to volunteer will come to the
clean-up day.
b. based on this probability, how many volunteers do they need to recruit to have
272 menle at the clean-up day?

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step-by-step explanation:

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

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step-by-step explanation: