Someone can help me with this assignment about The Pythagorean Theorem. I have to solve it for the missing side length (s).

If the value of x increases by 5, how does the value of m(x + 3) change? a) it increases by 5m. b) it increases by 8m. c) it decreases by 5m. d) it decreases by 8m.

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

Select the conic section that represents the equation. 3x2 + 3y2 -2x + 4 = 0