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Example Questions
Example Question #1 : How To Find Compound Interest
Jack has , to invest. If he invests two-thirds of it into a high-yield savings account with an annual interest rate of , compounded quarterly, and the other third in a regular savings account at simple interest, how much does Jack earn after one year?
First, break the problem into two segments: the amount Jack invests in the high-yield savings, and the amount Jack invests in the simple interest account (10,000 and 5,000 respectively).
Now let's work with the high-yield savings account. $10,000 is invested at an annual rate of 8%, compounded quarterly. We can use the compound interest formula to solve:
Plug in the values given:
Therefore, Jack makes $824.32 off his high-yield savings account. Now let's calculate the other interest:
Add the two together, and we see that Jack makes a total of, off of his investments.
Example Question #291 : New Sat
Approximate the Average Yearly change in the number of PhD's.
What this question is asking for is to approximate the slope of the line of best fit. To calculate the slope, we need to find find two points on the line. The best points to pick out is , and . Now we can find the rate of change by using the following equation.
, where are points on the line.
Example Question #292 : New Sat
The table below shows the number of college graduates per 2 months
Which 2 month period had the most college graduates?
In order to answer this question, we need to add each column up and see what column is the largest.
It looks like that the 2 month period has the most college graduates.
Example Question #252 : Coordinate Plane
The equation represents a line. This line does NOT pass through which of the four quadrants?
III
I
Cannot be determined
II
IV
III
Plug in for to find a point on the line:
Thus, is a point on the line.
Plug in for to find a second point on the line:
is another point on the line.
Now we know that the line passes through the points and .
A quick sketch of the two points reveals that the line passes through all but the third quadrant.
Example Question #293 : New Sat
A vase needs to be filled with water. If the vase is a cylinder that is tall with a radius, how much water is needed to fill the vase?
Cylinder
Example Question #221 : Algebra
Solve for x
Example Question #294 : New Sat
What is the focus of the above quadratic equation?
The focus is solved by using the following formula , where are the coordinates of the vertex, and is the distance from the vertex. To solve for , we use
, where is the coefficient in front of the term and is the focus.
Since , we can substitute in to get,
Now we need to find the vertex of the equation.
Since our equation is in vertex form, we can deduce that the vertex is at
So the focus is at
Example Question #295 : New Sat
The bar chart shows the number of consecutive heads for a fair coin. How many more 4 Heads were there compared to 3 Heads?
To figure this out, we need to go to the y-axis and find the number of 4 heads and 3 Heads there were. , . Now we find the difference between them, which is simply .
Example Question #296 : New Sat
Find the average rate of change between 3 Heads and 5 Heads
The average rate of change is calculated by the following.
So we simply do the following,
Example Question #293 : New Sat
Week 1 Homework Time Week 2 Homework Time
The above tables show how much time Amanda spent doing homework during the first 2 weeks of school. Which week has the largest standard deviation?
The first step is to calculate the mean for each table.
Recall how to find the standard deviation
Now we will apply this to each table.
Since , is our answer
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