I am supposed to find x but I genuinely have no idea where to even start on this one. Please help lol

The speed of a falling object increases at a constant rate as time increases since the object was dropped. which graph could represent the relationship betweent time in seconds, and s, speed in meters per second? speed of a falling object object over time

Find the greatest common factor of the polynomial: 10x^5+15x^4-25x^3 10x^5 x^3 5x^3 5

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.