Mp.4 model with math
when mary was born, she weighed 8 pounds. when she was 10 years old, she weighed
10 times as much. how much more did mary weigh when she was 10 years old than
when she was born? use exercises 1-2 to answer the question.
1. draw a picture, write and solve an equation to find mary's
weight, w, when she was 10 years old.
2. draw a picture, and write and solve an equation to find the
difference, d, between mary's weight when she was 10 years
old and when she was born.

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

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)