PLEASE HELP ME In the system of equations below, k is a constant. If the system has infinitley many solutions what is the value of k

3x-7y=k
-6x+14y=20

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4

If a distance of 75 yds is measured back from the edge of the canyon and two angles are measured , find the distance across the canyon angle acb = 50° angle abc=100° a=75 yds what does c equal?

2f(x)= x+3 if 4 < x < 8 2x if x 28 2