Please need help on some algebra questions

1. Consider the arithmetic series: 1 + 9 + 17 + 25 + ... Write a formula for the sum of the first n terms in this series.
A) 4n^2 - 3n
B) 6n^2 - 7n
C) 8n^2 - 5n
D) 10n^2 - n

2.Barry is solving the equation 3x^2 - 7x + 12 = 0 using the quadratic formula. He notices that, under the radical, the expression b^2 - 4ac will be negative. This indicates that the equation has
A) 2 irrational solutions
B) 2 imaginary solutions
C) 2 rational solutions
D) no solutions

3.In a bag of apples there are 4 green apples and 2 red apples. Bethany takes a green apple out of the bag and does not replace it. She then takes another apple out of the bag. What is the probability that the second apple is red?
A) 1/5
B) 1/6
C) 2/5
D) 2/6

4. What is the correlation between these points? (1, 2), (2, 2), (2, 3), (2, 4), (3, 4), (4, 5)
A) weak positive
B) weak negative
C) strong positive
D) strong negative

5. Consider the arithmetic series: 1 + 9 + 17 + 25 + ... Write a formula for the sum of the first n terms in this series.
A) 4n^2 - 3n
B) 6n^2 - 7n
C) 8n^2 - 5n
D) 10n^2 - n

you have the answers, so plug them in!

1. A (4(1)-3 =1)

3. you still have 2 red apples, and now there are five apples left, so the probability is 2/5

5. seems like the same as question 1!