Need Help with complex fractions

I'll start with the ones I have no clue about.

1.Match the expressions below with the letters labeling their equivalent expressions.

You must get all of the answers correct to receive credit.

1.http://hosted.webwork.rochester.edu/...3a81469fc1.png

2.http://hosted.webwork.rochester.edu/...39982db4d1.png

3.http://hosted.webwork.rochester.edu/...6442b39f21.png

4.http://hosted.webwork.rochester.edu/...8f67603591.png

a.http://hosted.webwork.rochester.edu/...8215457ef1.png

b.http://hosted.webwork.rochester.edu/...32d70a06d1.png

c.http://hosted.webwork.rochester.edu/...3bf2f7e631.png

d.http://hosted.webwork.rochester.edu/...8236155ee1.png

2.Solve for a: http://hosted.webwork.rochester.edu/...0533d7c5f1.png

3.The combined math and verbal scores for females taking the SAT-I test are normally distributed with a mean of 998 and a standard deviation of 202 (based on date from the College Board). If a college includes a minimum score of 950 among its requirements, what percentage of females do not satisfy that requirement?

Now these I have an idea but I still need help.

These two I'm not sure weither to use P or C. Afterwards I alos need help on how to do the next steps:

4.There are nine different positions on a baseball team. If a team has 17 players how many different line-ups can the team make?

The team can make _____ different line-ups.

Baseball games consist of nine innings. A team wants to change its line-up every inning. If no game goes to extra innings, and a season consists of 190 games, how many complete seasons can the team play without repeating a line-up?

The team can play ____ complete seasons without repeating a line-up.

5.Standard automobile license plates in a country display 2 numbers, followed by 2 letters, followed by 3 numbers. How many different standard plates are possible in this system? (Assume repetitions of letters and numbers are allowed.)

Now this one I thought I had down but apparently I got it wrong. I know the area of a triangle is 1/2 base*height. I used this equation and got 184000sq.ft. When i did the work afterward the work cames out to be wrong so maybe you guys know what I did wrong.

6.A triangular parcel of land has sides of lengths 400 feet, 920 feet and 1197 feet.

a) What is the area of the parcel of land?

b) If land is valued at 1500 per acre (1 acre is 43,560 feet ), what is the value of the parcel of land?