Math 143 Self-grading quiz 1

Today's date is 7-29-2025. You started this homework at time : 2:5 and 4 seconds
The above information is from your computer : be sure it is correct.
For grade credit, submit over the internet by 11:59 PM (= 23:59 hours) on Sunday 31 January 2016

Math 76O-143 Finite Mathematics
Self-marking Homework Assignment #1
Submit over the internet by 11:59 PM on Sunday 31 January 2016
Maximum value toward semester grade is 2 pts
In-class paper quizzes lack highlighted areas
Methods will be discussed in class;
CAUTION: Prof McFarland makes new tests each semester.

Average grade on Fall 2015 paper test #1 : 7.08

[1]

(a)(2 pts) Cell Touch (a phone company) just breaks even when a customer uses his cell phone 40 minutes per month, but makes a profit of $20 when that customer uses 80 minutes per month. If P is the profit Cell Touch makes on a customer who uses his cell phone x minutes per month, complete a linear equation relating P and x below. Enter numbers below, such as 3, 0, or -5.6
Scoring : One point for each correct number below

P = x +

To keep a chosen line visible above, slide the mouse vertically down off this edge of the graph

(b)(1 pt) Use your mouse at the right to create a line L parallel to the line joining (1,2) and (5,-6). To keep your chosen line visible, slide your mouse off the bottom edge of the graph.

(c) Enter numbers below which complete the equation of the line L which you were asked to display in [1b] above. Your equation will be in slope-intercept form ( y = mx+b ) :
Scoring : 1 pt for each correct number below

y = x +

I can solve these problems ;
can you?

For the following 3 questions, you must name the formula you plan to use (for half-credit), and then enter the answer to the question (for another half-credit).
On paper tests, these instructions will be somewhat different. See an example ?

Your available choices of formulas (not given on in-class paper tests) are :


Formula #1	Formula #2	Formula #3

Failure to practice this kind of problem accounted for
more lost points than any other problem type on this test

[2](a)

(1 pt) Lara is about to receive $40,000 from a bond bought 4 years ago at an annual interest rate of 7% compouded monthly. How much did Lara pay for this bond? (See instructions above)

[2](b)

(2 pts)Mrs. Betz signs a contract to lease a car from Ace Rentals; the rental payments are $450 at the end of each month for 2 years. Ace Rentals immediately sells this contract to it's bank. If the annual interest is 9% compounded monthly, what should the bank pay to Ace Rentals? (See instructions above)

[2](c)

(2 pts) The price tag on Chris' new car is $12,OOO. Chris makes a down payment of 25% of that price, and finances the rest with a loan bearing 12% annual interest compounded monthly, to be paid off in equal amounts at the end of each month for 36 months. What is Chris' monthly payment? (see directions in the box above)

Formula #1
Formula #2
Formula #3

Use only numbers (such as 22 or 19.95) ; do not enter a dollar sign "$"
Enter Chris' monthly payment : $

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