Solve by factoring, taking square roots, or, if necessary, by graphing. Give exact radical answers. For answers found by graphing, round to the nearest hundredth. $2 x^{2}-6 x-8=0$

Graph each equation. Describe each graph and its lines of symmetry. Give the domain and range for each graph. $x^{2}-y^{2}=25$

Sketch a graph of the parabola with the given vertex through the given point. vertex (1,5), point (2,11)

Solve each system.

$$\left\{\begin{aligned} x+y-z &=1 \\ 3 x+3 y+z &=3 \\ 2 x+2 y-2 z &=2 \end{aligned}\right.$$

Use synthetic division to show that x is a solution of the thirddegree polynomial equation, and use the result to factor the polynomial completely. List all the real solutions of the equation. Polynomial Equation $2 x^{3}-17 x^{2}+12 x+63=0$ Value of x $x=-\frac{3}{2}$

Find the opposite and the reciprocal of each number. $\sqrt{3}$

Simplify the expression.

$$\left(-5 t^{2}\right)\left(6 t^{-9}\right)$$

Each pair of figures is similar. Find the length of x.

Subtract. Use models if needed. (9x - 12) - (5x - 7).

Nosotros estabamos peleando cuando yo (me estaba rompiendo / me rompi) el dedo.

Negate the following sentences. If f is a polynomial and its degree is greater than 2, then $f^{\prime}$ is not constant.

Find the domain of the vector-valued function. r(t) = F(t) x G(t), where F(t) = t³i - tj + tk, G(t) = ∛t i + 1 / t+1 j + (t+2)k

Explain why the baking instructions on a box of cake mix are different for high and low elevations. Would you expect to have a longer or a shorter cooking time at a high elevation?

Solve by elimination.

$$\begin{array}{l}{7 x+6 y=33} \\ {2 x-6 y=-6}\end{array}$$