Melanie bought 7 packages of
greeting cards
Each package had
9 cards How many
greeting cards did
she get in all?

63 greeting cards

Step-by-step explanation:

7 * 9 = 63

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.

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