### All New SAT Math - Calculator Resources

## Example Questions

### Example Question #1 : New Sat Math Calculator

The graph below is the graph of a piece-wise function in some interval. Identify, in interval notation, the decreasing interval.

**Possible Answers:**

**Correct answer:**

As is clear from the graph, in the interval between ( included) to , the is constant at and then from ( not included) to ( not included), the is a decreasing function.

### Example Question #12 : Variables

If varies inversely as , and when , find when .

**Possible Answers:**

**Correct answer:**

The formula for inverse variation is as follows:

Use the x and y values from the first part of the sentence to find k.

Then use that k value and the given x value to find y.

### Example Question #3 : New Sat Math Calculator

Refer to the above diagram:

True or false: may also called .

**Possible Answers:**

False

True

**Correct answer:**

False

A line can be named after any two points it passes through. The line is indicated in green below.

The line does not pass through , so cannot be part of the name of the line. Specifically, is not a valid name.

### Example Question #1 : New Sat Math Calculator

Sally sells custom picture frames. Her monthly fixed costs are $350. It costs $10 to make each frame. Sally sells her picture frames for $35 each.

How many picture frames must Sally sell in order to break even?

**Possible Answers:**

**Correct answer:**

The break-even point is where the costs equal the revenues.

Let = # of frames sold

Costs:

Revenues:

Thus,

So 14 picture frames must be sold each month to break-even.

### Example Question #5 : New Sat Math Calculator

Mrs. Smith's 8th grade class has a weekly quiz. The graph below depicts the number of questions students got incorrect on their quiz and their corresponding quiz grade. Examining the graph, what type of correlation if any, exists?

**Possible Answers:**

More information is needed.

The graph depicts a constant correlation.

The graph depicts a negative correlation.

The graph depicts no correlation.

The graph depicts a positive correlation.

**Correct answer:**

The graph depicts a negative correlation.

Mrs. Smith's 8th grade class had a quiz last week. The graph below depicts the number of questions students got incorrect on their quiz and their corresponding quiz grade. In other words, the graph in this particular question is a dot plot and the question asks to find a correlation if one exists.

Recall that a correlation is a trend seen in the data. Graphically, trends can be either:

I. Positive

II. Negative

III. Constant

IV. No trend

For a trend to be positive the x and y variable both increase. A trend is negative when the y variable (dependent variable) decreases as the x variable (independent variable) increases. A constant trend occurs when the y variable stays the same as the x variable increases. No trend exists when the data appears to be scattered with no association between the x and y variables.

Examining the graph given it is seen that the x variable is the number of questions missed and the y variable is the overall score on the quiz. It is seen that as the number of questions missed increases, the overall score on the quiz decreases. This describes a negative trend.

In other words, the graph depicts a negative correlation.

### Example Question #6 : New Sat Math Calculator

Convert three yards to inches.

**Possible Answers:**

**Correct answer:**

To solve this problem, we need to know the conversions between yards to feet, and feet to inches. Write their correct conversions.

Convert three yards to feet.

Convert nine feet to inches.

### Example Question #91 : Linear / Rational / Variable Equations

Above is a graph which gives the high and low temperatures, in degrees Celsius, over a one week period for Washington City. Temperature given in degrees Celsius can be converted to the Fahrenheit scale using the following formula, where and are the temperature expressed in degrees Celsius and degrees Fahrenheit, respectively:

On how many days of the week shown on the graph did the temperature get above ?

**Possible Answers:**

Seven

Four

Five

Six

Three

**Correct answer:**

Three

Convert to the Celsius scale by setting in the conversion formula and solving for :

The question is therefore asking for the number of days that the temperature topped . Examine the graph below:

The high temperature was greater than on Tuesday, Friday, and Saturday - three different days.

### Example Question #8 : New Sat Math Calculator

Define an operation as follows:

For all real numbers ,

Evaluate: .

**Possible Answers:**

The expression is undefined.

None of the other responses is correct.

**Correct answer:**

, or, equivalently,

### Example Question #9 : New Sat Math Calculator

Which of the following is a true statement?

**Possible Answers:**

**Correct answer:**

Looking at the second statement, isolate x on one side with all other constants and variables on the other side.

Looking at the third statement, isolate z on one side with all other constants and variables on the other side.

Looking at the first statement, isolate y on one side with all other constants and variables on the other side.

From here, use these equivalencies so solve for y.

Substituting twice:

### Example Question #11 : Equations / Solution Sets

Solve for .

**Possible Answers:**

**Correct answer:**

Find all factors of 24

1, 2, 3,4, 6, 8, 12, 24

Now find two factors that add up to and multiply to ; and are the two factors.

By factoring, you can set the equation to be

If you FOIL it out, it gives you .

Set each part of the equation equal to 0, and solve for .

and

and