A boy is on a sled moving down a hill at 20 m/s. The combined mass of the sled and child is 100 kg. The momentum of the child and sled is
A. 5 kg. m/s
B. 20 kg. m/s
C. 1000 kg. m/s
D. 2000 kg. m/s

im here

step-by-step explanation:

d. it is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.

step-by-step explanation:

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