All SAT II Math II Resources
Example Questions
Example Question #1 : Graphing Quadratic Functions And Conic Sections
A baseball is thrown upward from the top of a one hundred and fifty-foot-high building. The initial speed of the ball is forty-five miles per hour. The height of the ball after seconds is modeled by the function
How high does the ball get (nearest foot)?
A quadratic function such as has a parabola as its graph. The high point of the parabola - the vertex - is what we are looking for.
The vertex of a function
has as coordinates
.
The second coordinate is the height and we are looking for this quantity. Since , setting :
seconds for the ball to reach the peak.
The height of the ball at this point is , which can be evaluated by substitution:
Round this to 182 feet.
Example Question #71 : Functions And Graphs
Give the -intercept(s) of the parabola of the equation
and
and
The parabola has no -intercept.
and
and
Set and solve for :
The terms have a GCF of 2, so
The trinomial in parentheses can be FOILed out by noting that and :
And you can divide both sides by 3 to get rid of the coefficient:
Set each of the linear binomials to 0 and solve for :
or
The parabola has as its two intercepts the points and .
Example Question #81 : Functions And Graphs
Give the amplitude of the graph of the function
The amplitude of the graph of a sine function is . Here, , so this is the amplitude.
Example Question #2 : Graphing Functions
Which of these functions has a graph with amplitude 4?
The functions in each of the choices take the form of a cosine function
.
The graph of a cosine function in this form has amplitude . Therefore, for this function to have amplitude 4, . Of the five choices, only
matches this description.
Example Question #2 : Graphing Trigonometric Functions
Which of these functions has a graph with amplitude ?
The functions in each of the choices take the form of a sine function
.
The graph of a sine function in this form has amplitude . Therefore, for this function to have amplitude 4, . Of the five choices, only
matches this description.
Example Question #4 : Graphing Trigonometric Functions
Which of the following sine functions has a graph with period of 7?
The period of the graph of a sine function , is , or .
Therefore, we solve for :
The correct choice is therefore .
Example Question #51 : Trigonometric Functions And Graphs
Which of the given functions has the greatest amplitude?
The amplitude of a function is the amount by which the graph of the function travels above and below its midline. When graphing a sine function, the value of the amplitude is equivalent to the value of the coefficient of the sine. Similarly, the coefficient associated with the x-value is related to the function's period. The largest coefficient associated with the sine in the provided functions is 2; therefore the correct answer is .
The amplitude is dictated by the coefficient of the trigonometric function. In this case, all of the other functions have a coefficient of one or one-half.
Example Question #1 : Graphing Piecewise And Recusive Functions
Define a function as follows:
How many -intercept(s) does the graph of have?
One
None
Two
Three
Four
None
To find the -coordinates of possible -intercepts, set each of the expressions in the definition equal to 0, making sure that the solution is on the interval on which is so defined.
on the interval
or
However, neither value is in the interval , so neither is an -intercept.
on the interval
However, this value is not in the interval , so this is not an -intercept.
on the interval
However, this value is not in the interval , so this is not an -intercept.
on the interval
However, neither value is in the interval , so neither is an -intercept.
The graph of has no -intercepts.
Example Question #2 : Graphing Piecewise And Recusive Functions
Define a function as follows:
How many -intercept(s) does the graph of have?
Three
Four
None
Two
One
Two
To find the -coordinates of possible -intercepts, set each of the expressions in the definition equal to 0, making sure that the solution is on the interval on which is so defined.
on the interval
However, this value is not in the interval , so this is not an -intercept.
on the interval
or
is on the interval , so is an -intercept.
on the interval
is on the interval , so is an -intercept.
on the interval
However, this value is not in the interval , so this is not an -intercept.
The graph has two -intercepts, and .
Example Question #3 : Graphing Piecewise And Recusive Functions
Define function as follows:
Give the -intercept of the graph of the function.
The graph does not have a -intercept.
To find the -intercept, evaluate using the definition of on the interval that includes the value 0. Since
on the interval ,
evaluate:
The -intercept is .