More BB Math Question Help?

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<p>Really appreciate it guys, can't figure these out myself.</p>

<p>A four-digit integer, WXYZ, in which W, X, Y, and Z each represent a different digit, is formed according to the following rules:
X = W + Y + Z
W= Y + 1
Z= W-3
What's the 4-digit integer?</p>

<p>Answer is 5940. I'm pretty sure you use the Z= W-3 and plug in Y+1 to solve for Z. Then plug that and W's answer into the first equation they give you so it's all X = Y's. I don't know how to tackle it from there. Stuck at: X = (Y+1) + Y + (Y-4), if that's even it.</p>

<p>The graph above shows the function g, where g(x)= k(x+3)(x-3) for some constant k. If g(a-1.2)=0, and a>0, what is the value of a?
The graph they mention is a upward opening parabola with the center at (0, -4) and x-intercepts at (+/-3,0). </p>

<p>Answer's 4.2, no idea how to even start that TBH.</p>

2

<p>Been discussed a number of times before…here’s one</p>

<p><a href=“http://talk.collegeconfidential.com/sat-preparation/814902-tough-math-question.html[/url]”>http://talk.collegeconfidential.com/sat-preparation/814902-tough-math-question.html&lt;/a&gt;&lt;/p&gt;

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<p>and the other…</p>

<p><a href=“http://talk.collegeconfidential.com/sat-preparation/1067904-less-than-1-minute-way-solve.html[/url]”>http://talk.collegeconfidential.com/sat-preparation/1067904-less-than-1-minute-way-solve.html&lt;/a&gt;&lt;/p&gt;

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<p>Didn’t know they had been asked before, thanks.</p>

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<p>No problem…so many smart people have been asking and answering questions here for so long. Google the key phrases of the question, then in the google results click on the “more-results-from-this-site” thingy and you will usually have your pick of a variety of solutions. It’s like free tutoring, 24hrs on demand</p>

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<p>Nice tip, I can only imagine the BB’s been eaten and digested here thousands of times over and over again. Definitely a lot cheaper than a real tutor too haha.</p>

7

<p>Whoa whoa whoa, is 5940 the only answer? Using the rules in the question, you can easily come up with 3520 or 4381.</p>

<p>To get 3520, let w=3
Then you get z=0
And also y=2
x=5
WXYZ= 3520</p>

<p>To get 4381, let w=4. Then y=3 and z=1 x then equals 8
WXYZ= 4831
Is this a multi-answer grid in, or am I ■■■■■■■■?</p>

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<p>Ohhhh okay the problem says z=w-5 not three. It seems like all you need to is just plug in a 1 digit number for w and see what works, fancy algebra isn’t necessary for this problem at all.</p>