All Flashcards
How do you determine the equation of a line given two points?
- Calculate the slope using . 2. Use the point-slope form: . 3. Simplify to slope-intercept form if needed.
How do you determine if a function represents exponential growth or decay?
Examine the base in . If , it's growth. If , it's decay.
How do you find the value of an exponential function after a certain number of years?
Substitute the number of years for in the function and calculate the result.
How do you find the equation of an exponential function given two points?
- Substitute the points into to get two equations. 2. Solve for in one equation. 3. Substitute the expression for into the other equation and solve for . 4. Substitute the value of back into the equation for .
How do you solve for in an exponential decay problem?
- Set up the equation . 2. Isolate the exponential term. 3. Take the logarithm of both sides. 4. Solve for .
How to determine the common difference in an arithmetic sequence?
Subtract any term from its subsequent term: .
How to determine the common ratio in a geometric sequence?
Divide any term by its preceding term: .
How do you convert an exponential function from base to base ?
Use the identity , so becomes .
How to write the equation of a line given a point and a slope?
Use the point-slope form: , where is the given point and is the slope. Then, rearrange to slope-intercept form if needed.
How do you determine the initial value of an exponential function from a table of values?
Find the y-value when x=0. This value is the initial value in the function .
Explain the relationship between linear functions and arithmetic sequences.
Arithmetic sequences are discrete points, while linear functions connect those points into a smooth line. Both involve an initial value and a constant rate of change.
Explain the relationship between exponential functions and geometric sequences.
Geometric sequences are discrete points, while exponential functions connect those points into a smooth curve. Both involve an initial value and a constant ratio.
What does a positive slope indicate?
A line that goes up from left to right. As x increases, y increases.
What does a negative slope indicate?
A line that goes down from left to right. As x increases, y decreases.
Describe exponential growth.
A function where the rate of increase is proportional to the current value, leading to rapid growth.
Describe exponential decay.
A function where the rate of decrease is proportional to the current value, leading to a rapid decline.
What is the significance of the base in an exponential function ?
If , it represents exponential growth. If , it represents exponential decay.
How are linear functions and arithmetic sequences used to model real-world scenarios?
They model situations with constant change, such as population growth or simple interest.
How are exponential functions and geometric sequences used to model real-world scenarios?
They model exponential growth or decay, such as compound interest or radioactive decay.
What is the importance of domain when dealing with sequences and functions?
Sequences are usually defined for positive integers, while functions can have a wider range of values (like all real numbers).
Define a linear function.
A function of the form , where is the y-intercept and is the slope.
What is the slope of a line?
The rate of change of a linear function; steepness and direction.
Define an arithmetic sequence.
A sequence with a constant difference between consecutive terms, defined as .
What is the common difference in an arithmetic sequence?
The constant value added to each term to get the next term.
Define an exponential function.
A function of the form , where is the initial value and is the base.
What is the base of an exponential function?
The factor by which the function's value changes for each unit increase in .
Define a geometric sequence.
A sequence with a constant ratio between consecutive terms, defined as .
What is the common ratio in a geometric sequence?
The constant value by which each term is multiplied to get the next term.
What is the y-intercept?
The point where the line crosses the y-axis, where .
What does the initial value represent in an exponential function?
The starting value of the function when x=0.