SECTION: Second SAT Test, Math Section 3
SCORE: 12/18 :[
INCORRECT ANSWER:
1. If "18 square root 18" = "r square root t," where r and t are positive integers and r>t, which of the following could be the value of rt ?
*18
*36
*108
*162
*324
Well my problem with this was i just reduced my radicals wrong and everything is basically fine. Just a careless mistake. I'll try to be more careful next time.
2. In the figure above, what is the value of c in terms of a and b ?
My only attempt to solving this problem was plugging in numbers
for the degrees and seeing how i could make a correlation between the numbers and an equation. That didn't work, so i need your advice on how to do this kind of problem in the RIGHT way.
3. In triangle PQR above, QS/QV =1/3 and PT/PR= 3/4. What is the value of the fraction (area of triangle PST)/( area of triangle PQR)?
First i subtract 1x from 3x to get the ratio for SV. So then i made a fraction: 2/3 so it was in accordance to the numerator and denominator of 3/4. Then found the common denominator and added them together to get 17/12 ( I DONT KNOW WHY.. .___.) and then i squared the 17 cause your suppos
ed to square the side for areas in ratio.
BUT that is completely wrong( i just found that out) because i came up with that after the test and i thought the answer to that problem was 149 but it was actually the answer to another problem.. the actual answer is 1/2
Help.
4. Let the function h be defined by h(x)= 14 + (x^2)/4. If h(2m)=9m, what is one possible value of m
Um this is just a little confusing.. there are 2 equations! Is this like systems of equations?
5. A merchant sells three types of clocks that chime as indicated by the clock marks in the table above. What is the total number of chimes of the inventory of clocks in the 90-minute period for 7:15 to 8:45?
Okay, so i got:
TYPE A, CHIMES ONCE ON THE 1/2 HOUR = 30 Chimes
TYPE B, CHIMES ONCE ON THE HALF HOUR= 3 Chimes
TYPE C, CHIMES ONCE ON THE HALF HOUR =9 Chimes
=42 chimes
Then i didn't know what to do with the rest, but the answer is 149
6. If the 5 cards shown are above are placed in a row so that "the dark square" is never at either end, how many different arrangements are possible?
I came up with 9 (retarded, again) but the answer is actually 72?
1 comment:
Opal, I don't like seeing these sad faces on the scores. Its ok, you're taking practice tests to learn. Be positive, how many times have I told you that??? Seriously???
1. Ok, you know what you're doing here. You'll eventually develop enough focus to not make careless mistakes
2. DO NOT PLUG IN NUMBERS. Use geometry.You just need to find out what the third angle is equal to in the top triangle. Remember, there are 180 degrees in a triangle. So in the left triangle, the third angle is 180-a-b. In the middle triangle, the third angle is 180-a-b. That means that, using the law of supplementary angles, 180-(180-a-b)-(180-a-b), or a+b-180+a+b, or 2a+2b-180. USE ALGEBRA/GEOMETRY, every single answer can be figured out using that stuff.
3. The area of a triange is 1/2*b*h. In the smaller triangle, the base is 3/4 of the larger, and the height is 2/3 of the larger. Thus, the smaller triangle is 1/2*(3/4*b)*(2/3*h). Thus the ratio of the larger to the smaller is [1/2*(3/4*b)*(2/3*h)]/[1/2*b*h]. Cancel out the 1/2, b, h and you get that its 2/3*3/4, or 6/12, or 1/2 the area. Make sense? You could plug in numbers here, but you don't even need to.
4. Not a system of equations. anything inside the h(in here) is supposed to be plugged into x. So you get that 14+(2m)^2/4=9m. Just simplify that equation. Ok, new rule: any time that they ask "what is one possible value" or "what could be the value" make sure you plug in after simplifying the equation. so just plug in numbers into that equation.
5. Opal, its a 90 minute period. I can't read the problem, so I have to talk to you about it. But you should be able to figure out what you did wrong.
6. Do you know how to do combinations and permutations? Look this up in one of the math books. You WILL learn it in 10th grade.
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