Let f be a twice differentiable function ona . r. given that f"(x)> 0 for all xe r .. (a.) f(x)=0 has exactly two solution on r b.) fx)=0 has a positivesolution

Let f be a twice differentiable function ona . R. Given that f"(x)> 0 for all xe R .. (a.) f(x)=0 has exactly two solution on R b.) fx)=0 has a positivesolution f(0) =0 and f'(0)=0 (c.) flx)=0 hasTo positiysolution if s(0)=0 and (0)0 (d.) f(x)=0 has no,positivesolution if f(00 and (00 N