MAFS.912.A-CED.1.4

In 1950, the average price of a car was about $2000. This may sound inexpensive, but the average income in 1950 was much less than it is now. To compare dollar amounts over time, use the formula  $V=\frac{A}{S}C$  , Where a is the old dollar amount, S is the starting year's Consumer Price Index (CPI), Cis the converting year's CPI, and V is the current value. How can you rearrange the formula to find the old dollar amount?

•  $A=\frac{VC}{S}$  

•  $A=\frac{S}{V}C$  

•  $A=\frac{C}{S}V$  

•  $A=\frac{VS}{C}$  

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CCSS.HSA.CED.A.4

The formula for simple interest plus starting principal, where A= amount, P= principal, r= interst rate per period, and t= time, is given below

 $A=P+\Pr t$  

Which could be used to find the time, t, if the amount, principal, and interest are known?

•  $A-P-\Pr=t$  

•  $\frac{A-P}{\Pr}=t$  

•  $\frac{A-\Pr}{P}=t$  

•  $\frac{A}{P+rt}=P$  

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CCSS.HSA.CED.A.4

A line is represented by the equation $3x+2y=4$ . What is another way to represent the same line?

•  $y=-\frac{3}{2}x+2$  

•  $y=\frac{3}{2}x+2$  

•  $y=\frac{3}{2}x+4$  

•  $y=-\frac{3}{2}x+4$  

If  $k=am+3mx$  , the value of m in terms of a, k, and x can be expressed as

•  $m=\frac{k}{a+3x}$  

•  $m=\frac{k-3mx}{a}$  

•  $m=\frac{k-am}{3x}$  

•  $m=\frac{k-a}{3x}$  

Tags

CCSS.HSA.CED.A.4

Loren was asked to solve the equation for x. Her solution is shown below.

In which step did Loren make her first mistake when solving the equation?

• Step 1

• Step 2

• Step 3

• Loren did not make a mistake