There are 7 rows of 20 chairs set up for an awards ceremony at the school. in each row, the 2 chairs on each end are reserved for students receiving awards. the rest of the chairs are for guests. how many chairs are there for guests?

Splash. Zone. 6 rows. 8 seats. 9 rows. 18 seats. Unlock the Problem. Name  each row. Brenda plans to plant peppers in the first 2 rows and the last 2 rows of the garden. The rest of  each end are reserved for students receiving awards. The rest of the chairs are for guests

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