Is 10 15 18 equal to a right triangle

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)