MA001 Activities Answer Key Errors - Log & Discuss

[sean]

A textbook just isn't a textbook unless there are some mistakes (I'm pretty sure that's a law of nature).

Got a beef with one of the answers in the answer key? Log the problem and discuss it here.

For example, p 16 of the textbook, problem #32 (answers p 439). Wrong sign, wrong value!

[Qualquant]

Q17, p25, in the textbook (http://www.saylor.org/site/wp-content/uploads/2011/12/SAYLOR-MA001-TEXT.pdf)

There seems to be an error in the answer, p440.

Answer is "36" where it should be "31".

Evaluate: k * 3^2 -(j+k) -5, where j = 4 and k = 5
5 * 3^2 -(4+5) -5
5*9 -(9) -5
45 -14
=31

[sean]

Thanks for flagging this. I second the math and agree with "31" for the answer.

[sean]

Unit 5.5.3 - "Practice - Dimensional Analysis”

The answer to #30 appears to be incorrect; rather than 1.42 lbs, the answer should be ~1.37 lbs.

[sean]

Unit 2.6 - "Unit 2 Practice Test"

The graph for #13 in the answer key shows the graphs of the lines on each side of the inequality rather than the graph of the inequality itself. The intersection of these graphs is at 4 and the graph of the inequality would be a dotted vertical line representing x > 4.

[acheung2681]

Hi,

Can somebody explain how the solution for question #24 in the "0.3 Practice: Order of Operations" is 3? I keep ending up at 5.

[sean]

I think you are correct and the book's answer key is incorrect -- I get 5 both by hand and by an expression solver.