Discover Questions

Could someone help me with these math problems? I can't figure them out. Solve the linear equation;
x+2y=15
y=-2x+0 9x-12y=-3
-12x+16y=4? Find Marginal Cost from total cost function (P^2)A(P)? What can you tell me about the flower of life? Sacred geometry? Where does it come from? Solve the equation for x.
e^x = 85? How many milliliters of concentrated of sulfuric acid (18 M) are required to make 7.0 L of 0.12M H2SO4?