Math help ! Pease help !?

Question

1)A paraskevidekatriaphobe fears this date when it falls on a Friday.
2)The sum of 1/2 + 1/4 + 1/8 + . . .
3)The last two digits of 5347.
4)The number feared by Pythagoreans, since it lies halfway between the only two integers that can be both the perimeter and the area of the same rectangle.
5) The base for the hexadecimal system.
6)A number that is neither prime nor the sum of two distinct primes
7)The smallest number of people in a room where the probability of two of them having the same birthday is at least 50 percent.
8)The number of Quidditch players on all the house teams at Hogwarts
9)The number of balls used in a standard pool game— not counting the cue ball.

Answer 1

1) Fear of Friday the 13th
(Paraskevi = friday / dekatria = 13/ phobia is the fear of something. )

2) 1/16

3) 47

4) 17 , because a 4x4 rectangle has a perimeter of 16 units and an area of 16 square units. A 3x6 rectangle has a perimeter of 18 units and an area of 18 square units. The number 17 is halfway between 16 and 18!

5) 16

6) 27

7) 3

8) Each House fields a team, which includes the seven players and often one or two reserve players as well. The teams have a team captain who not only plays but also acts as coach.

9) 15

Answer 2

2x + 4y = sixteen (a million) 3x - y = 3 (2) multiply (2) via 4 12x - 4y = 12 (3) upload (a million) and (3) 2x + 4y = sixteen (a million) 12x - 4y = 12 (3) 14x = 28 x= 28/14 = 2 substitute x = 2 in (2) 3(2) - y = 3 6 - y = 3 - y = 3 - 6 - y = -3 y = 3 for this reason x = 2 y = 3 2) x - 2x - 3 = 3 - x -3 = 3 -x = 3+3 - x = 6 x = -6 ~~~

Answer 3

1) I'm guessing 13
8) 4 houses/teams*7 players on each team=28

Answer 4

i agree with everyone on all but #2.
it looks like an infinite sum, which would be 1.

Answer 5

It's Friday the 13th.

Answer 6

1.13 2.7/8 3.47 4.?5.6 6.7?8?9.guess 15