<p>I'm doing a whole SAT packet 2-8, and having trouble with a few questions, I've attempted them but I'm getting answers far from the choices I'm given!! btw I'm not sure but think this is the 2007 practice test? if anyone has the answers please link!</p>
<p>If 3x+2y is 8 more than 3x-2y, the value of which of the following expressions can be determined?
a)x
B) y
C) 3x+2y
D) 3x-2y
E) xy</p>
<p>i put into quation form but idk how to continue on from there 3x+2y=8+3x-2y(is that even right?)</p>
<ol>
<li>in the following equation 2(r-t)/s=1 . R and S are positive. Which of the following is a correct expression for t in terms of r and s?</li>
</ol>
<p>A) 2r/s+2
B) 2r+2/s+2
C) s-2/2r
D) 2s/r+2
E) s+2/2r</p>
<p>i dont get this, can someone explain..</p>
<ol>
<li><p>the function f is defined by f(x)= 3(x^3-4) when f(x)=-36 what is the value of 5-4x
A)-13
B)-3
C)3
D)13
E)21
ok so since its a function problem i plugged in -36 into 3(x^3-4) but im getting a huge number am i doing this wrong???</p></li>
<li><p>when three times a number is multiplied by 5 the result is equal to the number multiplied by itself. what is one possible value of the number?
ok so if this is even right: 3n(5)= and thats where I'm lost with the second part...would 2 be a possible answer?</p></li>
<li><p>image: right triangle two legs one is a-2 and the other is a+2 and hypo is 20. find value a^2+4?
A)200
B)204
C)288
D) 392
E) 400
for this do i just plug into pythagorean theorem?? if yes i got stuck at the initial part with the a-2^2 and a+2^2 =400...</p></li>
</ol>