Homework Help Plz

[monkey_henry]

I hope that this is in the right forum, but I need help on some math homework.
Ok, here are the questions:
1)The sum of seven consecutive positive integers is always
A) odd B) a multiple of 7 C) even D) a multiple of 4 E) a multiple of 3
I think its B but im not sure.

2) Kalyn writes down all of the integers from 1 to 1000 that have 4 as the sum of their digits. If a/b (in lowest terms) is the fraction of these numbers that are prime, then a+b is
A)5 B)4 C)15 D) 26 E)19
I have no idea about this one.

3) Four identical isosceles triangles border a square of side 6 cm. When the four triangles are folded up they meet at a point to form a pyramid with a square base. If the height of this pyramid is 4 cm, the total area of the four triangles and the square is
A) 84 cm squared B) 98 cm squared C) 96 cm squared D) 108 cm squared E) 90 cm squared
I think it is D but again im not sure.

Plz post or pm me if u can help or give me the answer thanx!