Semester Review - PreAlgebra

What is the value of the expression?  $\frac{\left(-2\right)^0}{2^2}$  

• 0

•  $\frac{1}{16}$  

•  $\frac{1}{4}$  

•  $-\frac{1}{4}$  

 $\left(6.45\ \times10^6\right)\ \cdot720,000$  

Multiply. Enter your answer in scientific notation in the box.

Approximately how many times greater is  $6\times10^{-5}$  than  $5\times10^{-9}$  

• 120

• 1,200

• 12,000

• 120,000

What's the value of a?

 $a+1-2=4$  

Jenny and Ahmed have part time jobs.  The amount Ahmed earns is represented in the table. 

 The amount that Jenny earns is represented by the equation

 $y=9.5x$  , where x is the number of hours worked and y is the total pay.  

Choose all that are true

• Jenny earns more than Ahmed per hour

• Jenny earns less than Ahmed per hour

• Jenny earns $9.50 each hour

• Ahmed earns $8.25 each hour

Will bought 4 slices of pizza for $6.00

Let x represent the number of slices of pizza purchased and let y represent the total cost.

Which graph represents the relationship between pizza slices bought and cost?

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• 
• 
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How could you graph the equation

 $y\ =\ -\frac{1}{2}x-6$  

• Use -6 as the y-intercept and find the next point by going down 1 in the y direction and over 2 in the x direction

• Use the equation to find the x and y intercepts and draw a line 

• Use the equation and plug in different numbers for x to find the corresponding y value.  Plot the ordered pairs on the line.

• Start at -1/2 on the y-axis and go down 6 in the y direction and over 1 in the x direction to find the next point. 

What is the equation of the line?

• $y\ =\ -\frac{1}{2}x$

• $y\ =\ 2x$

• $y=\frac{1}{2}x$

• $y\ =\ -2x$

• Function 1 has a greater rate of change than function 2

• Function 2 has a greater rate of change than function 1

• Function 1 has a greater y-intercept than function 2

• Function 2 has a greater y-intercept than function 1

How many solutions does the equation have?

 $4\left(2a-4\right)+3\ =\ 8a-19$  

• 0

• 1

• Infinitely many