# Math homework help

## Math Homework

I need this assignment today, and I need it to be ORIGINGAL!!

Please carefully read and complete this assignment using the attached reference

Read and complete the "Collaborative Investigation" on p. 747 of your book, "To Buy or to Rent?".

Instead of a class presentation, prepare a written document (approximately 2 pages) and post it to the discussion board.

## A+ Answers

1. Use the given vectors below to find the scalar u • v.

u = -8i + 5j and v = -15i - 8j

A. 120

B. 160

C. 80

D. -40

2. Solve the triangle below, rounding to the nearest tenth.

A. B = 40°, a = 12.7, c = 8.1°

B. B = 45°, a = 8.2, c = 12.7°

C. B = 50°, a = 8.2, c = 12.7°

## A+ Answers

Revenues (in $million) of a chain of ice cream stores are listed for each quarter during the previous five years.

(20.51) Using the seasonal indexes and trend line, forecast revenues for the next four quarters.

Revenues (in $million) of a chain of ice cream stores are listed for each quarter during the previous five years.

(20.50) Determine the seasonal indexes.

## A+ Answers

**1.**Rewrite the following expression as a simplified expression containing one term.

**2.**Identify a and ß in the following expression, which is the right-hand side of the formula for cos (a –

ß).

## A+ Answers

1. Graph the inequality x +y < –5.

2. Compute

A. -19

B. -18

C. -17

D. -16

3. Compute the optimal traffic flow along each of the four roads marked x, y, z, and w in the diagram of the city block below.

A. There's no solution, because the system is dependent.

## Matrices can be used to encode and decode messages

Excel Project – Matrix Applications

Part 1 Cryptography

Matrices can be used to encode and decode messages. To begin with, we could assign the numbers 1-26 to the letters of the alphabet and assign the number 0 to a space between words. Then, we could translate any verbal message into a string of numbers from 0 to 26. Below is a table of each letter and its corresponding number.

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