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  1. AP Pre Calculus
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Difference between linear and polynomial models?

Linear: Straight line, constant rate of change | Polynomial: Curve, changing rate of change

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Difference between linear and polynomial models?

Linear: Straight line, constant rate of change | Polynomial: Curve, changing rate of change

Difference between polynomial and rational functions?

Polynomial: Can be written as a sum of terms with non-negative integer exponents. | Rational: Written as a ratio of two polynomials, may have asymptotes.

Difference between shifts and stretches of functions?

Shifts: Translate the graph without changing its shape. | Stretches: Change the shape by compressing or expanding the graph.

Difference between direct and inverse proportionality?

Direct: As one quantity increases, the other increases. | Inverse: As one quantity increases, the other decreases.

Difference between domain and range?

Domain: Set of possible input values (x). | Range: Set of possible output values (y).

Difference between continuous and piecewise functions?

Continuous: A single function defined over its entire domain without any breaks. | Piecewise: Defined by different functions over different intervals of its domain.

Difference between a vertical stretch and a horizontal compression?

Vertical Stretch: Multiplies the y-values by a factor, making the graph taller. | Horizontal Compression: Divides the x-values by a factor, making the graph narrower.

Difference between a vertical shift and a horizontal shift?

Vertical Shift: Moves the graph up or down by adding or subtracting a constant. | Horizontal Shift: Moves the graph left or right by adding or subtracting a constant from the x-value.

Difference between linear regression and polynomial regression?

Linear Regression: Finds the best-fitting straight line for the data. | Polynomial Regression: Finds the best-fitting polynomial curve for the data.

Difference between assumptions and restrictions in function modeling?

Assumptions: Simplifications made about the real-world scenario to create a tractable model. | Restrictions: Constraints on the domain or range of the function based on the real-world context.

Formula for gravitational force?

F=G∗m1∗m2r2F = G * \frac{m_1 * m_2}{r^2}F=G∗r2m1​∗m2​​

Formula for electromagnetic force?

F=ke∗q1∗q2r2F = k_e * \frac{q_1 * q_2}{r^2}F=ke​∗r2q1​∗q2​​

Volume of a cylinder?

V=πr2hV = \pi r^2 hV=πr2h

Volume of a cone?

V=13πr2hV = \frac{1}{3} \pi r^2 hV=31​πr2h

How to shift a function f(x)f(x)f(x) horizontally by hhh units?

f(x−h)f(x-h)f(x−h). Right if h>0h > 0h>0, left if h<0h < 0h<0.

How to shift a function f(x)f(x)f(x) vertically by kkk units?

f(x)+kf(x) + kf(x)+k. Up if k>0k > 0k>0, down if k<0k < 0k<0.

How to vertically stretch/compress a function f(x)f(x)f(x) by a factor of aaa?

a∗f(x)a * f(x)a∗f(x). Stretch if ∣a∣>1|a| > 1∣a∣>1, compress if 0<∣a∣<10 < |a| < 10<∣a∣<1.

How to reflect a function f(x)f(x)f(x) across the x-axis?

−f(x)-f(x)−f(x)

How to reflect a function f(x)f(x)f(x) across the y-axis?

f(−x)f(-x)f(−x)

General form of a rational function?

f(x)=p(x)q(x)f(x) = \frac{p(x)}{q(x)}f(x)=q(x)p(x)​, where p(x) and q(x) are polynomials.

Steps to construct a linear model from data?

  1. Plot the data. 2. Determine if a linear relationship exists. 3. Find the slope and y-intercept. 4. Write the equation in slope-intercept form: y=mx+by = mx + by=mx+b.

Steps to model data with a polynomial function using regression?

  1. Plot the data. 2. Choose a polynomial degree based on the shape. 3. Use a calculator to perform polynomial regression. 4. Write the resulting equation.

Steps to create a piecewise function?

  1. Identify the intervals. 2. Determine the function for each interval. 3. Write the function with the corresponding domains.

How to determine the domain and range of a rational function in a real-world context?

  1. Identify any restrictions on the input variable (e.g., values that make the denominator zero). 2. Consider the physical limitations of the scenario (e.g., non-negative quantities). 3. Determine the possible output values based on the restricted domain.

Steps to solve a problem involving inverse proportionality?

  1. Identify the inversely proportional quantities. 2. Write the general form of the rational function: y=kxy = \frac{k}{x}y=xk​. 3. Use given data to find the constant of proportionality, kkk. 4. Write the specific equation and use it to solve for the unknown.

How to find the value of a piecewise function at a given point?

  1. Identify the interval in which the point lies. 2. Use the function defined for that interval to calculate the value.

Steps to find the time it takes to fill a tank modeled by a piecewise function?

  1. Calculate the total volume of the tank. 2. Divide the total volume by the filling rate to find the time.

How to construct a function model when given a description of transformations?

  1. Start with the parent function. 2. Apply transformations step-by-step, writing the equation as you go. 3. Simplify the final equation.

How to determine the best type of function (linear, quadratic, exponential, rational) to model a given data set?

  1. Plot the data. 2. Look for patterns (straight line, curve, rapid growth/decay, inverse relationship). 3. Consider the real-world context. 4. Use regression to test different models.

How to deal with units in function modeling problems?

  1. Identify the units of each variable. 2. Make sure the units are consistent throughout the problem. 3. Include the correct units in your final answer.