Solve the system of linear equations.

$$\begin{align*} x_1 - 2x_2 &= 0 \\ 6x_1+2x_2 &= 0 \\ \end{align*}$$

Use Cramer's Rule to solve (if possible) the system of linear equations.

$$20x+8y=11\\12x-24y=21$$

Solve the linear system by graphing.

$$\begin{array} { l } { y = - 3 x - 7 } \\ { 15 x + 5 y = - 35 } \end{array}$$

Solve the system of linear equations by graphing.

$$\begin{array} { l } { x - y = - 2 } \\ { 2 x - 3 y = - 2 } \end{array}$$

Write each fraction in simplest form. -10/65

Find patterns in multiplying decimals. $0.4 \times 0.3$ = ______

Determine how many edges the graph has.

Write the given percent as a fraction in simplest form.

$$85 \%=$$

Use a calculator to evaluate the below expression. Give the answer in degrees and round it to two decimal places.

$$\sec^{-1}(2.7894)$$

Write each percent as a reduced fraction: a. 60%, b. 40%

What is the difference between an $\mathrm{Sa}$ and an Sb galaxy? Between an $\mathrm{SO}$ and an Sa galaxy? Between an Sb and an SBb galaxy? Between an E7 and an EO galaxy? Between an EO and an SO galaxy?

Use a software program or a graphing utility to solve the system of linear equations.

$$\begin{align*} 3x+3y+12z &= 6\\ x+y+4z &= 2 \\ 2x+5y +20z &= 10 \\ -x +2y+8z &= 4 \end{align*}$$

Write the given decimal as a fraction in simplest form.

$$0.33=$$

Solve the formula for the red variable. Surface area of cylinder: $S=2 \pi r^{2}+2 \pi r h$