ThatOnePerson

...You posted this today as well...

We split it up into two cases, one where the first number is odd and one where the first number is even.

ODD: We have 3 choices for the first, 2 choices for the second, 3 choices for the third, and so on, giving us a number of 108 possible ways.

EVEN: We have 2 choices for the first, 3 choices for the second, 2 choices for the third, and so on, giving us a number of 72 possible ways.

108+72 = 180 possible combinations.

Yes, I would definitely recommend what CPhill and heciticar said. Don't panic, you'll do just fine. Don't cram either, study at regular intervals. Good luck!

-deleted-

(Red, Green) : (2,2) (2,4) (2,6) (4,2) (4,4) (4,6) (6,2) (6,4) (6,6) - 9 ways.

Correct, so B.

Assuming that you want us to answer in terms of n, the first few numbers of this sequence are 1,3,6,10... those are the triangular numbers. We know that the formula for finding the sum of the first n triangular numbers is n(n+1)/2, so that's your answer.

1. We can rewrite is an algebraic equation, 50 = 1/4 * x. Multiplying both sides by 4 gets us x = $200, or C.

2. Five more than x is just 5 + x, or C.

I will attempt this problem, but I'm not sure whether or not my answer is right or not. I set x, y, and z all equal and I got sqrt(2) + 2 + sqrt(6).