Add -2 + (-7) = what is the answer

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

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

The number of branches on a tree demonstrates the fibonacci sequence. how many branches would there be on the next two levels of this tree? 13 | | | m branches