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Example Questions
Example Question #2 : Factoring Equations
Solve for .
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
Example Question #11 : New Sat Math Calculator
Given the inequality above, which of the following MUST be true?
Subtract from both sides:
Subtract 7 from both sides:
Divide both sides by :
Remember to switch the inequality when dividing by a negative number:
Since is not an answer, we must find an answer that, at the very least, does not contradict the fact that is less than (approximately) 4.67. Since any number that is less than 4.67 is also less than any number that is bigger than 4.67, we can be sure that is less than 5.
Example Question #61 : How To Find Arithmetic Mean
The histogram depicts the number of errors students missed on last week's homework assignment. Estimate the mean number of errors made.
To estimate the mean number of errors made, first calculate the mean of each bar in the histogram.
Recall to calculate a mean of a histogram bar use the formula:
The red bar's mean:
The yellow bar's mean:
The green bar's mean:
The teal bar's mean:
The blue bar's mean:
The purple bar's mean:
Now to estimate the mean of the number of errors, add the means of the bars together and divide by the total number of frequencies.
Example Question #11 : New Sat Math Calculator
Mrs. Smith assigns homework to her class once a week and records each student's results. For last week's assignment, the histogram depicts these results. If the homework set was worth twenty points, what is the range of grades for last week's assignment?
Note: For each error, one point is subtracted from the total points possible.
Mrs. Smith assigns homework to her class once a week and records each student's results. For last week's assignment, the histogram depicts these results. If the homework set was worth twenty points, what is the range of grades for last week's assignment?
Note: For each error, one point is subtracted from the total points possible.
To solve this problem, first identify what the highest and lowest grade on the assignment was. The highest grade will be the one with the least amount of errors made and the lowest grade will be the one with the most amount of errors made.
The red bar in the histogram says that students made between zero and two errors. In other words, either: 0, 1, 2 errors.
The yellow bar in the histogram says that the students made between two and four errors. Since the red bar includes two errors the yellow bar only includes 3 or 4 errors.
The green bar in the histogram says that students made 5 or 6 errors.
The teal bar in the histogram says that students made 7 or 8 errors.
The blue bar in the histogram says that students made 9 or 10 errors.
The purple bar in the histogram says that students made 11 or 12 errors.
This means that at least one student made zero errors on the assignment and therefore did not loose any points. Therefore, the highest grade on the assignment was twenty.
The histogram shows that at least one student made twelve errors on the test. Therefore, the lowest grade on the assignment would be:
From here, calculate the range.
Example Question #1 : How To Factor A Polynomial
How many negative solutions are there to the equation below?
First, subtract 3 from both sides in order to obtain an equation that equals 0:
The left side can be factored. We need factors of that add up to . and work:
Set both factors equal to 0 and solve:
To solve the left equation, add 1 to both sides. To solve the right equation, subtract 3 from both sides. This yields two solutions:
Only one of these solutions is negative, so the answer is 1.
Example Question #121 : Quadratic Functions
Which of the following graphs correctly represents the quadratic inequality below (solutions to the inequalities are shaded in blue)?
To begin, we analyze the equation given: the base equation, is shifted left one unit and vertically stretched by a factor of 2. The graph of the equation is:
To solve the inequality, we need to take a test point and plug it in to see if it matches the inequality. The only points that cannot be used are those directly on our parabola, so let's use the origin . If plugging this point in makes the inequality true, then we shade the area containing that point (in this case, outside the parabola); if it makes the inequality untrue, then the opposite side is shaded (in this case, the inside of the parabola). Plugging the numbers in shows:
Simplified as:
Which is not true, so the area inside of the parabola should be shaded, resulting in the following graph:
Example Question #251 : New Sat
What is the -intercept of the function that is depicted in the graph above?
This question tests one's ability to recognize algebraic characteristics of a graph. This particular question examines a linear function.
Knowing the standard and the concept for which it relates to, we can now do the step-by-step process to solve the problem in question.
Step 1: Identify the general algebraic function for the given graph.
Since the graph is that of a straight line, the general algebraic form of the function is,
where
Step 2: Identify where the graph crosses the -axis.
Therefore the general form of the function looks like,
Step 3: Answer the question.
The -intercept is three.
Example Question #291 : Geometry
What is the slope of the line depicted by the graph?
Looking at the graph, it is seen that the line passes through the points (-8,-5) and (8,5).
The slope of a line through the points and can be found by setting
:
in the slope formula:
Example Question #252 : New Sat
The table and graph describe two different particle's travel over time. Which particle has a lower minimum?
This question is testing one's ability to compare the properties of functions when they are illustrated in different forms. This question specifically is asking for the examination and interpretation of two quadratic functions for which one is illustrated in a table format and the other is illustrated graphically.
Step 1: Identify the minimum of the table.
Using the table find the time value where the lowest distance exists.
Recall that the time represents the values while the distance represents the values. Therefore the ordered pair for the minimum can be written as .
Step 2: Identify the minimum of the graph
Recall that the minimum of a cubic function is known as a local minimum. This occurs at the valley where the vertex lies.
For this particular graph the vertex is at .
Step 3: Compare the minimums from step 1 and step 2.
Compare the value coordinate from both minimums.
Therefore, the graph has the lowest minimum.
Example Question #2 : How To Find The Solution To An Inequality With Addition
If and , then which of the following could be the value of ?
To solve this problem, add the two equations together:
The only answer choice that satisfies this equation is 0, because 0 is less than 4.