Find the domain of the function f(x) = square root of 9-x^2

How many real and imaginary solutions does the equation x^2-3x=-2x-7 have?

When only separate discreet points are graphed it is called?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is