2 to the 3rd power - 4 x 2 + 3

Which best describes the strength of the correlation, and what is true about the causation between the variables? it is a weak negative correlation, and it is not likely causal. it is a weak negative correlation, and it is likely causal. it is a strong negative correlation, and it is not likely causal. it is a strong negative correlation, and it is likely causal.

Guys i really need or i have to stay late up night

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25