What is the area of a circle with a diameter of 8 meters (use 3.14 for o )

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

Solve 17= -13 - 8x and show your work.