basic algebra problems in MTH133

1) The following graph shows the depreciation for the corporate airplane from 2006 to 2009. The plane was purchased new in 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 two points on the graph in (x, y) form.
b) Find the slope (rate of depreciation) of this line:
c) Find the equation of this line in slope-intercept form.
d) If the rate of depreciation continues at the present rate, what will be the plane’s value in the year 2017? Show how to use the equation from part c) to obtain your answer.

2) Suppose that the width of a rectangle is 5 inches shorter than the length and that the perimeter of the rectangle is 50 inches. The formula for the perimeter of a rectangle is P=2L+2W.
a) Set up an equation for the perimeter involving only L, the length of the rectangle.
b) Solve this equation algebraically to find the length of the rectangle. Find the width as well.

3) A marketing group developing online ad space is offering two payment options:
Option 1: $210 set up fee plus $10/inch of the ad
Option 2: No set up fee but $25/inch of the ad.
Let x = inches of the proposed ad, for example, x = 2 for a column ad that is 2″ long.
a) Write a mathematical model representing the total ad cost, C, in terms of x for the following:
b) How many inches of ad space would need to be purchased for option 1 to be less than option 2? Set up an inequality and show your work algebraically using the information in part a. Summarize your findings in a brief sentence.

4) Use the graph of y = x^2 + 4x – 5 to answer the following:
a) Without solving the equation or factoring, determine the solution(s) to the equation, x^2 + 4x – 5 = 0 , using only the graph.
b) Does this function have a maximum or a minimum?
c) What are the coordinates of the vertex in (x, y) form?
d) What is the equation of the line of symmetry for this graph?

5) The profit function for Wannamaker Trophies is P(x) = -0.3x^2 + fx – m, where f represents the design fee for a customer’s awards and m represents the monthly office rent. Also, P represents the monthly profit in dollars of the small business where x is the number of awards designed in that month.

a) If $60 is charged for a design fee, and the monthly studio rent is $1,500; write an equation for the profit, P, in terms of x.
b) How much is the profit when 50 award designs are sold in a month?
c) How many award designs 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 + 7
b) y = x^2 – 4x
c) Place your graphs here.

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