**Choice J**

$$Width =\frac12\cdot Length = \frac12\cdot 12 =6 \\ $$ $$\Rightarrow Perimeter = 6+6+12+12=36$$

**Choice C**

Let x be the number of plastic bottles Jo Ellen return to the store: $$$0.05\times6+$0.1\times8+$0.05\cdot x=$1.6 \\$$ $$\Rightarrow x = 10$$

**Choice A**

$$Sienna's\ pay = $75+25\% \times Total \ weekly \ sales = $75+25\% \times w=0.25w+75 $$

**Choice G**

A system of equations can be represented by an augmented matrix.

In an augmented matrix, each row represents one equation in the system and each column represents a variable or the constant terms.

**Choice J**

**Choice G**

$$I. \ y(height)=h_{0}-\frac{1}{2}gx^2 \\$$ $$II. \ y=kx \\$$ $$III. y=a\cdot t\cdot t=at^2$$

**Choice J**

$$Mean \ of \ the \ first \ 4 \ projects = \frac{70+75+85+94}{4}=81 \\$$ $$ Mean \ of \ the \ 5 \ projects = \frac{70+75+85+94+x}{5}\geq 81+2=83 \\ $$ $$\Rightarrow x \geq 91$$

**Choice E**

**Choice G**

From the smallest to the largest: $$3, 5, 5, 5, \underline{6}, 7, 9, 11, 12$$

**Choice D**

When x = 2, the …

**Choice J**

$$AD=AB+BD=(AC-BC)+BD=12-3+12=21$$

**Choice C**

$$Total \ amouunt = $1000 …

**Choice H**

**Choice C**

$$Number \ of \ students …

**Choice G**

Let the line be: $$y …

**Choice C**

Definition: Function, domain, range

A …

**Choice H**

$$Distance \ from \ Wilderness …

**Choice A**

$$\frac{x}{\frac{1}{x}}=\frac{4}{25} \\$$$$ \Rightarrow x^2=\frac{4}{25} \\ …

**Choice F**

$$\sin x=\frac{10}{26} \\ \Rightarrow x=\sin^{-1}(\frac{10}{26})$$

**Choice E**

$$Area \ of \ \triangle …

**Choice K**

By definition, $$\cos \angle B …

**Choice C**

$$x=\sqrt{13^2-12^2}=5$$

**Choice H**

$$(\frac{200}{x}-1)\cdot(x+10)=200 \\ $$$$\Rightarrow x= 40$$

**Choice C**

$$Length \ of \ each …

**Choice F**

$$6a+3b=12 \ (I.) \\$$ $$ …

**Choice E**

$$\angle C=\frac{180°-42°}{2}=69°$$

**Choice F**

As seen from the graph, …

**Choice B**

$$AB=\sqrt{4^2+7^2}=\sqrt{65}$$

**Choice K**

$$g=\frac{3t+s}{3+n} \\ $$$$\Rightarrow g(3+n)=3t+s \\ …

**Choice B**

$$\frac{x^2+5x+6}{x+2}+x+5 = \frac{(x+2)(x+3)}{x+2}+x+5 =x+3+x+5=2x+8$$

**Choice J**

$$Area \ of \ shaded …

**Choice A**

$$(1+2i)^2=1+4i+(2i)^2=1+4i+4i^2=1+4i+4(-1)=-3+4i$$

**Choice H**

$$Number \ of \ blue …

**Choice A**

$$80x^3y+48x^2y^2=\underline{16x^2y}(5x+3y)$$

**Choice K**

The coordinates of the center …

**Choice D**

$$\tan \angle DCE=\frac{5-2}{13-11}=\frac{3}{2}$$

**Choice J**

$$AAD=\sqrt{11^2+3^2}=11.4 \ light \ years …

**Choice A**

The denominator of any fraction …

**Choice G**

The statement illustrates the commutative …

**Choice D**

$$V_{Cone \ B}=\frac{1}{3} \pi r_{Cone …

**Choice B**

Since the two lines are …

**Choice D**

**What is the standard equation …**

**Choice K**

To be the side lengths …

**Choice C**

Let the number of seconds …

**Choice G**

ab is a positive even …

**Choice B**

The sum of the fractions: …

**Choice K**

$$x^{6a}=(x^{2a})^3=(3)^3=27$$

**Choice D**

$$The \ slope \ of …

**Choice J**

$$x+y=360° \\$$ $$ \Rightarrow 4y …