<p>hm.. i thought math 1c was no longer given as a test :p</p>
<p>just want to confirm one more time..</p>
<p>how many people think problem 49 is 7 or 2?</p>
<p>thanks for all the help</p>
<p>for 50 (the question about the number of points that lie on 10 lines with only two lines intersecting at one point and not three), is the answer 45? I thought so, but I put 55. grr.
so what is my score if i got 1 wrong? what about 2?</p>
<p>prime minister,</p>
<p>you can get conclude that the funciton is 2x-13 because its saying f(2x+3)=4x-7, so its saying when you plug in (2x+3) for x, you get 4x-7.</p>
<p>You need to use inspection (there might be a more mathematical way to do it but this isn't that hard)</p>
<p>you plug in 2x+3 and you get 4x-7, so that means the "2x" part was multiplied by 2 to get the "4x" part. so put the original function with a 2x.</p>
<p>2(2x+3)+k = 4x-7, where k is the number you have to add to get the constants in the funtion to equal eachother.</p>
<p>solve the equation for k.
4x+6+k = 4x-7
6 + k = -7
k=-13</p>
<p>so the orginal function turns out to be f(t)=2t+k (k=-13); therefore
f(t)=2t-13</p>
<p>then solve for what value of t = 1, and the answer ends up as 7.</p>
<p>I'll admit it seems a little challenging for the Math Level I, but they can't give everyone 800's now can they?</p>
<p>Hey, thanks so much.</p>
<p>i just wanted to say, good luck to everyone in the future</p>
<p>hope everyone gets good results</p>