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Example Questions
Example Question #4 : How To Find Compound Interest
A truck was bought for in 2008, and it depreciates at a rate of per year. What is the value of the truck in 2016? Round to the nearest cent.
The first step is to convert the depreciation rate into a decimal. . Now lets recall the exponential decay model. , where is the starting amount of money, is the annual rate of decay, and is time (in years). After substituting, we get
Example Question #191 : New Sat
What is in radians?
To convert degrees to radians, we need to remember the following formula.
.
Now lets substitute for degrees.
Example Question #81 : Coordinate Geometry
Lines P and Q are parallel. Find the value of .
Since these are complementary angles, we can set up the following equation.
Now we will use the quadratic formula to solve for .
Note, however, that the measure of an angle cannot be negative, so is not a viable answer. The correct answer, then, is
Example Question #192 : New Sat
Find the equation of a line that goes through the points , and .
For finding the equation of a line, we will be using point-slope form, which is
, where is the slope, and is a point.
We will pick the point
If we picked the point
We get the same result
Example Question #193 : New Sat
Find the equation of a line that passes through the point , and is parallel to the line .
Since we want a line that is parallel, we will have the same slope as the line . We can use point slope form to create an equation.
, where is the slope and is a point.
Example Question #1 : How To Find The Perimeter Of A Rectangle
A rectangular garden has an area of . Its length is meters longer than its width. How much fencing is needed to enclose the garden?
We define the variables as and .
We substitute these values into the equation for the area of a rectangle and get .
or
Lengths cannot be negative, so the only correct answer is . If , then .
Therefore, .
Example Question #15 : New Sat Math No Calculator
If , what does equal?
Subtract and from the both sides to get .
Divide both sides by , to get
Example Question #3 : How To Graph A Quadratic Function
What is the equation of the graph?
In order to figure out what the equation of the image is, we need to find the vertex. From the graph we can determine that the vertex is at . We can use vertex form to solve for the equation of this graph.
Recall vertex form,
, where is the coordinate of the vertex, and is the coordinate of the vertex.
Plugging in our values, we get
To solve for , we need to pick a point on the graph and plug it into our equation.
I will pick .
Now our equation is
Let's expand this,
Example Question #194 : New Sat
Which expression is equivalent to the following quotient? For .
All we need to do is remember the quotient rule for exponents.
We apply this to each term and we get the following.
Example Question #2 : How To Find The Solution To A Rational Equation With Lcd
Solve for x:
The first step is to cancel out the denominator by multiplying both sides by 7:
Subtract 3 from both sides to get by itself: