Help on SAT questions please

Test Preparation SAT Preparation
1

<p>Can you tell me if I did these right? Thanks!:)</p>

<p>R is the midpoint of line segment PT, and Q is the midpoint of line segment PR. If S is a point between R and T such that the length of segment QS is 10 and the length of segment PS is 19, what is the length of segment ST?</p>

<p>Is it 14? (13-17)</p>

<p>A telephone company charges x cents for the first minute of a call and charges for any additional time at the rate of y cents per minute. If a certain call costs 5.55 and lasts more than a minute, which of the following expressions represents the length of that call, in minutes?</p>

<p>Is it (555-x)/y</p>

<p>Thanks for yall's help!:)</p>

2

<p><em>bump please</em></p>

3

<p>:( The suspense is KILLING me! ;)</p>

4

<p>I say 17 for the first one and (555-x)/y + 1 for the second... I could be wrong though.</p>

5

<p>I didn't understand the first one...I was getting like 9 (not one of the choices), so I guessed.</p>

6

<p>I drew it out... If PS is 19 and QS is 10, then PQ has to be 19-10=9. That means QR also has to be 9 because Q is the midpoint of PR. If QR is 9 and QS is 10, then RS has to be 1. RS+ST=PQ+QR=18, and since RS is 1, ST has to be 17.</p>

7

<p>Thanks!!!!</p>