A company has an inventory of books that is decreasing at a constant rate. After selling the book for 4 days, they have 8.840 books in stock and after selling it for 10 days they have 7,850 books in stock. Let B represent the number of books they have in stock and let d represent the days they have been selling it. Write a linear equation for B in terms of d.

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

(x) - (y) = (1 + 4i)

the answer would be a 24

step-by-step explanation:

c=2πr=2·π·3=24