13.) 0 = 1000 cg(x) AU ~ tin 9: R R, and an increasing continuous function f:R, R. If f(t)dt for every x R, then F is satisfies F(x)= [Question ID=5890] 1. Increasing over [0, a] and decreasing over [a, co), for some a > 0 [Option ID=23554] 2. Decreasing over [0, a] and increasing over [a, oo), for some a > 0 [Option ID=23555] 3. Increasing [Option ID=23556] 4. Decreasing [Option ID=23557]