What is 4% of 720? i need help for a test

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Apiling for a high-rise building is pushed by two bulldozers at exactly the same time. one bulldozer exerts a force of 1250 pounds in a westerly direction. the other bulldozer pushes the piling with a force of 2650 pounds in a northerly direction. what is the direction of the resulting force upon the piling, to the nearest degree? a. 65 n of w b. 25 n of w c. 45 n of w d. 35 n of w