 7.2.12: Solve each system in Exercises 1213. c2x  y + z = 13x  3y + 4z = ...
 7.2.13: Solve each system in Exercises 1213. cx + 2y  z = 52x  y + 3z = 0...
 7.2.14: Find the quadratic function y = ax2 + bx + c whose graph passes thr...
 7.2.15: The greatest cause of death in the 20th century was disease, killin...
Solutions for Chapter 7.2: Precalculus 5th Edition
Full solutions for Precalculus  5th Edition
ISBN: 9780321837349
Solutions for Chapter 7.2
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Angle between vectors
The angle formed by two nonzero vectors sharing a common initial point

Compounded continuously
Interest compounded using the formula A = Pert

Cosine
The function y = cos x

Exponential regression
A procedure for fitting an exponential function to a set of data.

Firstdegree equation in x , y, and z
An equation that can be written in the form.

Parabola
The graph of a quadratic function, or the set of points in a plane that are equidistant from a fixed point (the focus) and a fixed line (the directrix).

Positive association
A relationship between two variables in which higher values of one variable are generally associated with higher values of the other variable, p. 717.

Probability of an event in a finite sample space of equally likely outcomes
The number of outcomes in the event divided by the number of outcomes in the sample space.

Product rule of logarithms
ogb 1RS2 = logb R + logb S, R > 0, S > 0,

Quadrant
Any one of the four parts into which a plane is divided by the perpendicular coordinate axes.

Rational zeros theorem
A procedure for finding the possible rational zeros of a polynomial.

Reflection across the yaxis
x, y and (x,y) are reflections of each other across the yaxis.

Response variable
A variable that is affected by an explanatory variable.

Scatter plot
A plot of all the ordered pairs of a twovariable data set on a coordinate plane.

Secant line of ƒ
A line joining two points of the graph of ƒ.

Symmetric difference quotient of ƒ at a
ƒ(x + h)  ƒ(x  h) 2h

Translation
See Horizontal translation, Vertical translation.

Upper bound test for real zeros
A test for finding an upper bound for the real zeros of a polynomial.

Variable
A letter that represents an unspecified number.

Vertical translation
A shift of a graph up or down.