<p>I say easy, because I suck at math and probably easy for you guys:</p>
<li>A weather watch camera is set so that its shutter opens every 31 secs. If g(h) represents the number of times the camera’s shutter opens in h hours, which of the followin defines g?</li>
</ol>
<p>A) g(h)=31h
B) g(h)=31 x 3600h
C) g(h)=31h/3600
D) g(h)=3600h/31
E) g(h)=31 x 3600/h</p>
<li><p>How many postive 4 digit integers have 1 as their first digit and 2 or 5 as their last?</p></li>
<li><p>Let the function s be defined so that s(x) is the area of a semi-circle with a diameter of x. If s(6)+s(8)=s(b), what is the value of b?</p></li>
<li><p>If v/s-2 and r/s=t/v, then for t cannot = 0, r/t=?</p></li>
</ol>
<p>a) .5
b) 2
c) t/v
d)v/2s
c) 2v/s</p>
<li><p>Making 10 loafs of bread requires 24 cups of flour and 4 tablespoons of baking power. If the proportions in this recipe are to be used to make 3 loaves of bread, how many cups of flour will be needed?</p></li>
<li><p>Telephone rate bwteen 2 cities is 90 cents for the first 3 minutes and c cents for each additonal minute. The total charge is reduced by 65% on calls made after 11 PM. The cost, in DOLLARS, of a 30-minute call made at 11:15 PM between these 2 cities is:</p></li>
</ol>
<p>A) .35(.9)+27c
B) .35(.9+.27c)
c) .35(.9 +9c)
d) .65(.9+27c)
e) .65(.9+.3c)</p>
<p>I have a question to add to if you dont mind. :</p>
<p>A list of numbers consists of ‘p’ positive and ‘n’ negative numbers. If a number is picked at random from this list, the probability that the number is positive is (3/5). What is the value of (n/p)?</p>
<p>1.D There are 3600 seconds in an hour, and since it opens once every 31 seconds it will open 3600/31 times per hour, so the answer is 3600h/31</p>
<ol>
<li><ol>
<li>There is one possibility for the first digit, ten for the second, ten for the third, and two for the last. 1X10X10X2 = 200</li>
</ol></li>
<li><ol>
<li>The area varies with the square of the diameter. Note that 6 and 8 and 10 make a Pythagorean triplet.</li>
</ol></li>
<li><p>You’re missing something - “If v/s -2” is meaningless. Do you mean v/s = 2?</p></li>
<li><p>You’re making 3/10 as many loaves, so you need (3/10)(24) = 72/10 = 36/5 = 7 1/5 cups of flour.</p></li>
</ol>
<p>6.B The cost will be 90 cents (.9 dollars) + (27 minutes * c/100) = (.9 +.27c), except that we must multiply by 35%,</p>
<p>sleepy: Three out of every five numbers are positive. Accordingly, the remaining two out of five are negative. So n/p = 2/3</p>
<p>1.D- just the number of seconds in an hour ( 3600) times h hourse divided by 31</p>
<ol>
<li><p>I’d do it with combinatorics…there are 4 spaces…the first one can be filled in only by 1 number ( 1), the second and third can be filled in by 10 different digits ( 1,2,3…9,0) and the 4th digit can be filled in 2 different ways ( 2 or 5)…so 1<em>10</em>10*2= 200</p></li>
<li><p>so s(x) is just a function for (pi r^2)/2 ( since its a semicricle)…but notice that it says x is the diameter, so its really (pi (x/2)^2)/2
just plug in the 6 in that little formula, do the same for 8, add them, and now just solve for the x on the other side ( remember that the x will be the radius, so multiply it by two to get the diameter, b)</p></li>
<li><p>sorry don’t really understand, something is missing there</p></li>
<li><p>10/24=3/x…x=7.2</p></li>
<li><p>I’d say B</p></li>
</ol>
<p>Yeah I meant s divided by v=2 not -. Sorry!</p>
<p>Thanks for the help</p>
<p>ah thanks a lot pyroclastic! i always overlook the obvious.</p>
<p>oh ok then…its 2…
s/v= 2
s=2v</p>
<p>and if r/s=tv then r/t= s/v so 2v/v= 2
hope that helps</p>
<p>I need help on the following problems:</p>
<p>In the xy-plane, line L passes through the origin and is perpendicular to the line 4x + y = k, where K is a constant. If the two lines intersect at the point (t, t+1), what is the value of t?</p>
<p>(a)-4/3
(b)-5/4
(c)3/4
(d)5/4
(e)4/3</p>
<p>If the average of x and y is k, which of the following is the the average of x, y, and z?</p>
<p>(a)(2k+z)/3
(b)(2k+z)/2
(c)(k+z)/3
(d)(k+z)/2
(e)2(k+z)/3</p>
<p>thanks in advance!</p>
<p>1.sorry…</p>
<p>2.A
(x+y)/2= k, so x+y=2k, and (x+y+z)/3= ? so (2k+z)/3 is the answer</p>