A car travels a distance of 210 miles in a time of 3.2 hours. What is its average speed rounded to 1dp?

n

step-by-step explanation:

the first one, all those points on the line just make a strait line.

y=3n + 1

step-by-step explanation:

this is wrong because it says the second number is one less and i added one instead

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