Need this questions answered onlinemat1033_ch2dislab_fall2015.pdfDAYTONA STATE COLLEGE ONLINE INTERMEDIATE ALGEBRA
CHAPTER 2 DISCUSSION LAB
Directions: In order for your discussion lab to be accepted for grading it must be saved
in the correct format and named properly. Refer to your Course Addendum, available at
class.daytonastate.edu, for more details.
Problem 1
A student is asked to solve
2x – 5 < 5x – 11
for x and does the following:
2x – 5x – 5 < 5x – 5x – 11
-3x – 5 < -11
-3x – 5 + 5 < -11 + 5
-3x < 6
x < -2
At what steps did the student make a mistake? Explain in your own words what went wrong
and why it is wrong. Make sure that you analyze the entire problem as there may be multiple
mistakes.
What is the correct answer?
Problem 2
The cost C of producing x number of scientific calculators is given by : C = 4.50x + 3000
and the revenue R from selling them is given by: R = 16.50x.
a) Find how many calculators must be sold to break even by setting C=R and solving
for x.
b) Find how much money is needed to produce the break-even number of calculators.
1
c) Explain in your own words what happens if a company makes and sells fewer products
than the break-even number.
d) Explain in your own words what happens if more products than the break-even number
are made and sold.
Problem 3
A student is asked to solve the equation
3(x – 3v) = 5 + 7v
for v and does the following:
3x – 9v = 5 + 7v
-9v = 5 + 7v – 3x
v=
5 + 7v -3x
-9
At what steps did the student make a mistake? Explain in your own words what went wrong
and why it is wrong. Make sure that you analyze the entire problem as there may be multiple
mistakes.
What is the correct answer?
Problem 4
For what value(s) of c will the equation |ax+b| = c have
a) one solution?
b) no solution?
c) two solutions?
2
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