Can you me, which equation results from adding the equations in this system? -2x+y=8 5x-y=-5 a)7x=13 b)7x=3 c)3x=3 d)3x=13

William invested $5000 in an account that earns 3.8% interest, compounded annually. the formula for compound interest is a(t) = p(1 + i)t. how much did william have in the account after 6 years? (apex)

Roger could feed 5 walruses with 4 kilograms of fish. how many walruses could he feed with 7.2 kilograms of fish?

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)