mary is 14. In four years, her age will be 2/3 the age of her sister. How old will Mary's sister be in two years

29

Step-by-step explanationn

her age will be 18 years old in 4 years, and 18 is 2/3 of her sister's age so her sister's age will be 27(because 2/3 of 27 is 18) and 2 years later, her age will be 27+2=29

answer: 8d

step-by-step explanation:

45+5= 50+5=55+5=60

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)