My brain activity drops down to a vegetative state when it comes to math so if any of y’all can lend a helping hand that’d be sensational

If there is no real number solution to the quadratic equation x^2+2x+c=0 what is a possible value of c? 1 -2 0 3

What is the definition of exponential decay?

The expression 1.01*1.005(^t) gives the amount of money, in thousands of dollars, in carter's savings account (t) years after he opens it. what does 1.01 represent in this expression?