Need fast,!

what is the greatest common factor of:
1)30,3
2)-12,-10
3)-56,49,-63
4)15,5
5)45,20
6)27,72,81
7)4,12

Percy rides his bike 11.2 miles in 1.4 hours at a constant rate. write an equation to represent the proportional relationship between the number of hours percy rides, x, and the distance in miles, y, that he travels.

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).

What is y-5=3(x+1) in slope intercept form