What is the solution of the equation −x2 − 2x = 5?

In triangle abc, the length of side ab is 12 cm, the length of side bc is 5 cm, and the length of side ca is 9 cm. find the measure of angle a using the law of cosines.

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two

Determine domain and range, largest open interval, and intervals which function is continuous.