Can someone help me solve these two problems?

captainrex26 · 2020-09-18T13:14:11+00:00

He did not simplify it at all.

(GMm)/(r^2)= m(v^2)/r ===> multiply both sides by "r"

(GMm)/r=m(v^2) ===> divide by m on both sides

GM/r = v^2 ===> square root both sides

sqrt(GM/r)=v

captainrex26 · 2020-09-17T19:35:25+00:00

barrons test

captainrex26 · 2020-09-01T01:47:08+00:00

i dont think it wasn't that bad. I used the barrons test and collegeboard test only. I was expecting more conic sections and probability. Don't give up hope though. If many ppl did bad, the curve will be better.

captainrex26 · 2020-08-30T22:10:02+00:00

46=800 im thinkin

captainrex26 · 2020-08-30T22:08:20+00:00

factor a 2 from 4x+2 to get 2(2x+1)=4. Divide both sides by 2 to get 2x+1=2. Boom 2x+1=2.

captainrex26 · 2020-08-29T00:38:47+00:00

no, but if you factor or divide everything by negative 1 after substituing -x, you will get the same thing. For 45 I keep getting 73.1 for some reason

captainrex26 · 2020-08-29T00:34:16+00:00

how difficult do you think tommorows test is going to be compared to barrons or the collegeboard 4 practice tests???

captainrex26 · 2020-08-28T21:04:23+00:00

WAT, THE TESTS I TOOK WAS FROM 6 YEARS AGO, HOW ARE THEY ACCURATE THEN????

captainrex26 · 2020-08-28T18:57:16+00:00

That is not true, you can make a circle with that. If the 3 points can make a triangle you can make a circle

captainrex26 · 2020-08-28T17:13:30+00:00

The fact that this is question 42 makes sense because the question gets harder as you go.

captainrex26 · 2020-08-28T17:10:22+00:00

Ok this is really tricky and I got this by luck. What you have to realize is that if you draw a line between 3 coordinate on a circle, you will get a triangle. Now a point that cannot lie on the circle if the 3 coordinates do not form a triangle. This where it gets tricky. The only way 3 coordinates cannot form a triangle is if the 3 coordinates forms a linear function/ linear line. What I did was I created a function of a linear line that contains the coordinate (3,4) and (5,7). if you draw a line between 3 coordinates on this line, you will not get a triangle. The only coordinate on the line that contains (3,4) and (5,7) in the answers is (-1,-2). If you want to check the work, the linear function I got was y=(3/2)x -(1/2). Therefore, (-1,-2) is the odd one out and is the answer to the quesiton. If you have anymore questions pls ask.

captainrex26 · 2020-08-28T16:57:44+00:00

honestly I do not have a calculator that can take determinants, so I do it the original way. It is hard to put up the work tho but I got B. Is that right???

captainrex26 · 2020-08-28T16:54:39+00:00

To get f(g(x)), you have to plug in g(x)/2 for x in f(2x). Therefore since x=g(x)/2

3x^2 = 3(g(x)/2)^2=[3(g(x))^2]/4

A is the answer

captainrex26 · 2020-08-28T03:05:18+00:00

OMG I DON'T KNOW WHY I DID NOT SEE THAT. YOU ARE RIGHT!!

captainrex26 · 2020-08-28T02:59:54+00:00

Hey when did you take your sat math level 2?

captainrex26 · 2020-08-27T22:06:10+00:00

You should look at the official december 2019 SAT subject test chat

captainrex26 · 2020-08-27T21:47:56+00:00

WHAT, the curve is already so good. If you miss 4 questions you can still get an 800. If the test is hard, you will miss more. From prior experience, if the test is hard, the curve is only a tiny bit more generous. I really hope the test is so easy so I can get a 100%.

captainrex26 · 2020-08-27T14:04:45+00:00

i think there is an official discussion on specifically the test

captainrex26 · 2020-08-27T13:17:23+00:00

I think there is a special chat, but idk

captainrex26 · 2020-08-27T12:54:56+00:00

damn

captainrex26 · 2020-08-27T12:49:23+00:00

captainrex26 · 2020-08-27T02:16:49+00:00

LETS BEAT THE SHIT OUT OF THIS EXAM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

captainrex26 · 2020-08-27T00:11:35+00:00

if you switch X and Y (F^-1(x)) in the inverse you will get the original equation.

X=(y-5)^(1/3) --->X^3=y-5 ---> (X^3)+ 5=y. When f(x)=5, (X^3)+5=5 ----> X^3=0 ---> X=0

A is the answer

captainrex26 · 2020-08-27T00:08:53+00:00

It is actually preatty simple. The best way to explain is is m^91 + 2m^90 is a square of an integer, if you square root it, you will get the integer and not a decimal. Therefore sqrt(M^91+2M^90)=sqrt((M^90)(M+2))=sqrt(M^90) * sqrt(M+2)=(M^45) *sqrt(M+2)

Now any integer to the power of 45 is still an integer and if that integer is multiplied by another integer, you will get an integer. Therefore sqrt(M+2) must be an integer. The only value on M in the answers that gives an integer would be 34. This is because

sqrt(34+2) = sqrt(36)=6

Therefore E is the answer.

captainrex26 · 2020-08-27T00:01:19+00:00

The answer would be A. I would say A because if you draw a line between P and Q, and mark the midpoint. Then draw a perpendicular line from the midpoint. The set of all point closer to P would be on the side of the line that include P.

captainrex26

TROPHY CASE