# Algebra homework help

## A+ Answers

Assignment

This Assignment requires you to use Excel. Make sure to use the Unit 5 Assignment template located in Doc Sharing when you turn in your answers.

Question 1

Determine the error for each of the following forecasts. Then, calculate MAD and MSE.

Period Value Forecast Error

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Lesson 3

Question 1

"Y varies directly as the nth power of x" can be modeled by the equation:

A. y = kxn.

B. y = kx/n.

C. y = kx*n.

D. y = knx.

Question 2

Find the vertical asymptotes, if any, and the values of x corresponding to holes, if any, of the graph of the following rational function.

f(x) = x/x + 4

A. Vertical asymptote: x = -4; no holes

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LESSON 5

Question 1

Solve the following system of equations using matrices. Use Gaussian elimination with back substitution or Gauss-Jordan elimination.

x - 2y + z = 0

y - 3z = -1

2y + 5z = -2

A. {(-1, -2, 0)}

B. {(-2, -1, 0)}

C. {(-5, -3, 0)}

## A+ Work

MATH 107 QUIZ 2 September, 2015 Instructor: S. Sands

1. (4 pts) Which of these graphs of relations describe y as a function of x?

That is, which are graphs of functions? Answer(s): ____________

(no explanation required.) (There may be more than one graph which represents a function.)