Question

Am I right?
4. If a positive integer n, divided by 5 has a remainder 2, which of the following must be true?
I n is odd
II n + 1 cannot be a prime number
III (n + 2) divided by 7 has remainder 2
A. none
B. I only
C. I and II only
D. II and III only
E. I, II and III

Answer 1

I got none, or A.

Answer 2

Correct.

Answer 3

ya right a is correct

Answer 4

5. A solid cube of side 6 is first painted pink and then cut into smaller cubes of side 2. How many of the smaller cubes have paint on exactly 2 sides?
I got 8, right?

Answer 5

Yes, that is correct.

Answer 6

ty!

Answer 7

No problem.

Answer 8

6. Line l contains the points (3,1) and (4,4).
If line m is a different line, parallel to line l in the same coordinate plane, which of the following could be the equation of line m?
A. y = 3x - 8
B. y = 1/3x - 3
C. y = -3x - 8
D. y = 3x + 1
E. y = -8x + 3

I got D, why can't be A though?

Answer 9

5. A solid cube of side 6 is first painted pink and then cut into smaller cubes of side 2. How many of the smaller cubes have paint on exactly 2 sides?
I got 8, right?



Look in the figure above. Each edge has a middle 2 x 2 cube with 2 faces painted pink.
When you take into account the top face and the bottom face, their 8 edges have 8 cubes with 2 faces painted pink. Then each of the 4 vertical edges also has a cube painted pink on two faces, so the total is 12, not 8.