<p>Only have 2 this time. I couldn't fnd them in the sticky and I am just wondering about the explanations. I noticed I missed a lot less problems on this 4th practice test so I am getting the hang of this. If I seem stupid for asking for these explanations I am sorry. I might already know the explanation but I just want to make sure beforehand. Anyways, here are the 2 I couldn't find.</p>
<h1>17 Page 586:</h1>
<p>The graph of y=f(x) is shown above. Which of the following could be the graph of f(x+2)?</p>
<p>Pictures are in book</p>
<h1>8 Page 613:</h1>
<p>The total daily profit p, in dollars, from producing and selling x units of a certain product is given by the function p(x)=17x-(10x+b), where b is a constant. If 300 units were produced and sold yesterday for a total profit of 1900, what is the value of b?</p>
<p>a. -200
b. -100
c. 0
d. 100
e. 200</p>
<p>I had -200 so I think I made a stupid mistake. I'd like to know your explanation though.</p>
<p>just set the right sides of the last two equations equal & solve
1900 = 17<em>300-10</em>300-b
b = 300(17-10)-1900
b = 300(7)-1900
b = 2100-1900
b = 200</p>
<p>I only had like 4-5 problems wrong out of the whole thing. Every damn test I get one of the easiest problems wrong. The rest are one or two of the hard ones. Usually it is due to careless mistakes or misinterpreting the question.</p>
<p>I hope by the 7th or 8th test I start getting perfect scores because this is starting to annoy me.</p>
<p>It’s OK to make mistakes during a practice test, but a problem like #8 is something you should be able to solve afterwards to your satisfaction, especially when you are not under test-taking conditions. If you do that, then you can find out your own mistakes and get better…</p>