<p>if 10,000 microns= 1 centimeter
and 100,000 angstrom units= 1 centimeter,
how many angstrom units equal 1 micron</p>
<p>how do you do this question?</p>
<p>Well, 10,000 microns = 100,000 angstrom units if they are both equal to a centimeter.</p>
<p>Then you can set it up in a ratio:</p>
<p>10,000 microns over 100,000 angstrom units = 1 micron over X angstrom units </p>
<p>Then you can just solve the ratio. (100,000 angstrom units times 1 micron) divided by 10,000 microns equals 10 angstrom units.</p>
<p>Alternately, if you just see when you set up the right side of the ratio that you can "cross out" the zeros to find the ratio of 1 to 10, you can do it that way.</p>
<p>I think that's right...I'm not exactly the math genius around here though.</p>
<p>if 10,000 microns= 1 centimeter
and 100,000 angstrom units= 1 centimeter,
how many angstrom units equal 1 micron</p>
<p>Well, since both 10,000 microns and 100,000 angstrom units equal 1 cm, it can be inferred that:</p>
<p>10,000 microns = 100,000 angstrom units</p>
<p>Now divide each side by 10,000 so that you get 1 micron = ? angstrom units.</p>
<p>Your answer should be: 1 micron = 10 angstrom units.</p>
<p>sry but i got 2 more questions the 1o real test book i have doesnt tell how the answer was found:</p>
<p>1) Gear A has 72 teeth and Gear B has 48 teeth how many complete revolutions does gear A make when gear B makes 9 revolutions?s </p>
<p>2) Bill and his son tommy together weighs 250lbs. If Bill weight is 10 pounds more than 3 times Tommys, what is Tommy in lbs.</p>
<p>I did 3(x + 10) + 30= 250 but its not right what did i do wrong?</p>
<pre><code> Thanx,
I wont ask anymore questions
</code></pre>
<p>1) 48 x 9 = 432</p>
<p>so.. 72 x what = 432?? </p>
<p>ANSWER: 6</p>
<p>2) this could be wrong though...</p>
<p>3x-10=250-x</p>
<p>x=65</p>
<p>2) Bill and his son tommy together weighs 250lbs. If Bill weight is 10 pounds more than 3 times Tommys, what is Tommy in lbs.</p>
<p>Let B= Bill's weight and T=Tommy's weight.
B+T=250
B-10=3T</p>
<p>With that, you get:
T=250-B
B-10=3(250-B)
4T=760, T=190</p>
<p>Substituting that back into the original, B=60</p>
<p>Oh, oops all you needed to find was Tommy's weight. It's 190lbs.</p>
<p>i dont get how you get b-10=3t</p>
<p>hehe I just took that test 2 hours ago....
Math - 700 (missed 2, left 5 blank, eh I'm going to slow on Math)
Verbal - 530 (I suck)</p>
<p>Sister Math - 450 (7th grader and didn't know she could use a calc)
Verbal - 600 (kicked my butt that's sad) </p>
<p>But to your question
2) Bill and his son tommy together weighs 250lbs. If Bill weight is 10 pounds more than 3 times Tommys, what is Tommy in lbs.</p>
<p>Bill + Tom = 250
Bill = 3(Tom) + 10, this is how the other person got B - 10 = 3T (rewrote the equation)</p>
<p>Now that you have B + T = 250 and B = 3T + 10, Plug "B = 3T + 10 into the other equation for B:</p>
<p>3T + 10 + T = 250
Solve:
4T + 10 = 250
Algebra from here:
T = 60, therefore Tommy is 60 lbs.
I got this right by the way. Hope that helps. </p>
<p>And if anyone could tell me how to do that sequence problem faster it would be great, I did it by hand.... not time efficient for SAT</p>
<p>The first term of a sequence is -3 and every term after the first is 5 more than the term immediatley preceding it. What is the value of the 101st term?
Answer: 497, (I just want to know how to do it faster)</p>
<p>for the orignial question since i think the 250 one has been qualified try this</p>
<hr>
<p>if 10,000 microns= 1 centimeter
and 100,000 angstrom units= 1 centimeter,
how many angstrom units equal 1 micron</p>
<p>I'm pretty sure this is how u do it</p>
<p>start with 1 micron</p>
<p>now u do equivalent fractions</p>
<p>u have 1 micron and u want to get rid of microns so now put it in the denomintor</p>
<p>so: micron X 1 cm
___________10,0000 microns since ur multiply by 1 since there equavilent</p>
<p>then u want to get rid of cm so put cm in the denom</p>
<p>micron X 1 cm X 100,000 angs
_____<strong><em>10,000 mic</em></strong>1 cm</p>
<p>the cm cancel out and the microns cancel out but u have 1/10,000 multiply this by 1000,000 angs and u get 10 angs equivalent to the orginnal micron i explained this completely wrong haha but this is the proper way ill try to find a website that explains this</p>
<p>if u have time and have difficulty with this concept go here: it may take a while but it explains it really well atleast browse through it since its a concept ull need to know for the math sat 1s and IIs prob</p>
<p><a href="http://oakroadsystems.com/math/convert.htm%5B/url%5D">http://oakroadsystems.com/math/convert.htm</a></p>