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Jack is 5 times old as bill. Ten years from now, Jack will be at least 3 times as old as Bill will be then. At least how old is jack now?
a. 10 years
b, 20 years
c. 25 years
d. 30 years
e. 50 years -
The distance of the plane 2x-3y+5z+3=0 from the point (2,3,-1)
a. 1.1236
b. 2.545
c. 3.65
d. 8
e. 12.45 -
If Sap is the sum of the first four terms of an arithmetic sequence ans Sgb is the first four terms of a geometric sequence ans Sap/Sgb = 2/3. Considering r =2 for both of them, what is Sap + Sgb
a.20
b.30
c.40
d.50
e.60
- J = 5B, and J+10 ≥ 3(B+10), or 5B + 10 ≥ 3B + 30. Solve to get B ≥ 10, or J ≥ 50. I would suspect the answer is E.
However this is a poorly worded problem since if E is correct, then every other answer choice is correct.
- Given a plane ax + by + cz + d = 0 and a point (x0, y0, z0), the distance from (x0, y0, z0) to the plane is
|ax0 + by0 + c*z0 + d| / sqrt(a^2 + b^2 + c^2).
Plug and chug.
- What is r? It might make sense that r is the common ratio of the geometric sequence, but this is an unfounded assumption, and you can’t define a common ratio for an arithmetic sequence, in general.
Where are these problems from? The quality seems fairly poor.
oh okay I understood 1, but I tried your way for 2 and it is none of the choices. I found this book online,s o I am using it
https://books.google.com.sa/books?id=fUUuN9Z9ZOUC&pg=PA2&lpg=PA2&dq=sat+2+math+iic+practice+test&source=bl&ots=R8sDmcmi8I&sig=S1WM74jUGUXDEDKAvkUVGWVDbj4&hl=en&sa=X&ved=0ahUKEwjGxs2goMbMAhWLbBoKHX-eD_Q4ChDoAQgaMAA#v=onepage&q=sat%202%20math%20iic%20practice%20test&f=false
I used barrons, so I need an alternative so I am using this. It has a lot of mistakes. There is a question in which itsaid: there is a rectangle with side 3,4, and 5. A rectangle is 2d, but the dimensions are for 3d. They meant a rectangular prism, but I should deal with it
@gameplayer yeah the answer to 2. is 7/sqrt(38) which is roughly 1.1356.
You should probably use a different book.
I’ll try to look for another one.