Country Day's scholarship fund receives a gift of $ 130000. The money is invested in stocks, bonds, and CDs. CDs pay 6 % interest, bonds pay 2.8 % interest, and stocks pay 11.8 % interest. Country day invests $ 15000 more in bonds than in CDs. If the annual income from the investments is $ 8070 , how much was invested in each vehicle? Country Day invested $
in stocks.
Country Day invested $
in bonds.
Country Day invested $
in CDs.

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.

2 2/3 hours duhh silly

step-by-step explanation:

hello from mrbilldoesmath!

answer:   (7x + 6y) ( 49x^2 - 42xy + 36y^2)

discussion:

in general, the factorization of a^3 + b^3 is

a^3 + b^ 3 = (a + b) ( a^2 - ab + b^2)

in our case note that 343 = 7^3 and 216 = 6^3 so the equation becomes:

343x^3 + 216y^3 = (7x)^3 + (6y)^3

if you think of a (above) as 7x and b as 6y the factorization becomes

343x^3 + 216y^3 =

((7x + 6y) (   (7x)^2 - 7x*6y + (6y)^2)   =

(7x + 6y) ( 49x^2 - 42xy + 36y^2)

you,

mrb

(a + b) (a^2 - a b + b^2)

my guess is

step-by-step explanation: