To practice for a competition, Christian swam 520 meters in the pool each day for 2 weeks. How many kilometers did Christian swim in those 2 weeks? 1 m = 0.001 km

7.28 km

Step-by-step explanation: so first we need to figure out the amount of meter he swam. 2 weeks is 14 days. 14 ✕ 520 = 7280

Then we figure out the km. 7280 converts to km is 7.28  km

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)