# Algebra

1. At the kickoff of a football game, the receiver catches the ball at the left side of the goal line and runs for touchdown diagonally across the field. How many yards would he run? (football field is 100 yards long and 160 feet wide)

2. At a large size U.S company, the profit, y is related to the number of Vice Presidents, x according to the equation y=-25 +300x. What number of Vice presidents will maximize the company profit? What is the maximum possible profit in millions?

3. At the denver Broncos game the number of tickets sold decreases with increasing price, but the total revenue generated for the broncos team does not necessary decrease. Use the formula R=p(48000-400p) to determine the revenue when the price p of each ticket is 20dollars and when the price p is 25 dollars. What price would produce revenue of 1.28 million dollars? Use the graph to find the price that determines the maximum revenue for his Broncos football team.

4. Ken has just got a job offer and been commuting 60 miles each way to and from work. Returning home one evening he increased his average speed 9 miles per hour above the rate on the way to work. This increase in miles per hour reduced his return time by 20 minutes. What was his average speed going to work and returning home.

(solving rational inequality) State and graph solution set

9. vertex and intercept -sketch graph and state domain and range

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#### Solution Summary

Neat and step-by-step solutions are provided.

Algebra Homework Help 5: To show your work, you will need to include the algebra used to compute the solution to any equations.

1. The following graph shows how a 4-color web printing press depreciates from the year 2006 to the year 2010. It was purchased new in the year 2006; therefore x = 0 represents the year 2006.

X - axis (horizontal) = years starting from 0 = 2006 and increasing by 0.5 years

Y - axis (vertical) = price in $ amounts

a) List the coordinates of any two points on the graph in (x, y) form.

(___, ___),(___, ___)

b) Find the slope of this line:

c) Find the equation of this line in slope-intercept form.

d) If trend for the depreciation of the press continued, what would be its value in the year 2015? Show how you obtained your answer using the equation you found in part c).

2. Suppose that the length of a rectangle is three cm longer than twice the width and that the perimeter of the rectangle is 90 cm.

a) Set up an equation for the perimeter involving only W, the width of the rectangle.

b) Solve this equation algebraically to find the length of the rectangle. Find the width as well.

Length ______, Width ______

3) A temporary agency offers two payment options for administrative help:

Option1: $25 daily fee plus $10/hour; or

Option 2: No daily fee but $15/hour

Let x = total hours worked.

a) Write a mathematical model representing the total temp cost, C, for a four-day temporary administrative assistant in terms of x for the following:

Option 1: C=_________________

Option 2: C=_________________

b) How many total hours would the temp need to work in the four day period for the cost of option 1 to be less than option 2. Set up an inequality and show your work algebraically using the information in part a. Don't forget about the daily fee in Option 1 (it's a four day proposition!). Do not assume an eight our workday. Any number of hours per day is possible.

4) Use the graph of y = 7 - 6x - x2 to answer the following:

a) Without solving the equation (or factoring), determine the solutions to the equation 7 - 6x - x2 = 0 using only the graph. Explain how you obtain your answer(s) by looking at the graph:

b) Does this function have a maximum or a minimum? Explain how you obtain your answer by looking at the graph:

c) What is the equation of the line (axis) of symmetry for this graph?

d) What are the coordinates of the vertex in (x, y) form?

5) The profit function for the Recklus Hang gliding Service is P(x) = -0.4x2 + fx - m, where f represents the set up fee for a customer's daily excursion and m represents the monthly hanger rental. Also, P represents the monthly profit in dollars of the small business where x is the number of flight excursions facilitated in that month.

a) If $40 is charged for a set up fee, and the monthly hanger rental is $800; write an equation for the profit, P, in terms of x.

b) How much is the profit when 30 flight excursions are sold in a month?

c) How many flight excursions must be sold in order to maximize the profit? Show your work algebraically. Trial and error is not an appropriate method of solution - use methods taught in class.

d) What is the maximum profit?

6. Graph the equations on the same graph by completing the tables and plotting the points. You may use Excel or another web-based graphing utility.

a) y = 2x - 5

Use the table; find at least 3 points using any values for x.

x y

-1

1

3

b) y = 3x - x2

Use the values of x provided in the table.

x y

-1

0

1

2

3

4