Please help me with this

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Which function can be used to model the monthly profit for x trinkets produced? f(x) = –4(x – 50)(x – 250) f(x) = (x – 50)(x – 250) f(x) = 28(x + 50)(x + 250) f(x) = (x + 50)(x + 250)

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2