need help in physics

 1- State how many significant figures are proper in the results of the following calculation:

(15.1)(0.20 - 30.05 + 170.2)

2- Cos 126.39°

3-  Soccer fields vary in size. A large soccer field is 90.3 m long and 83.1 m wide. What is its smallest dimension in inches? (Assume that 1 meter equals 3.281 feet.)

4- Solve: (1.6 x 102) / (3.5 x 103) 

5- Solve: (4 x 10-1)2 

6- Sin 109.65°

7- Mount Everest, at 29,028 feet, is the tallest mountain on the Earth.  What is its height in kilometers? (Assume that 1 kilometer equals 3,281 feet.)

8- What is the exponent of the solution to this expression?

4-2.1 x 45.8

9- What is the height in meters of a person who is 7 ft, 6.7 in. tall? (Assume that 1 meter equals 39.37 in.)

10- State how many significant figures are proper in the results of the following calculation:

(106.7)(98.2) / (46.210)(1.01) 

11-  Two legs of a triangle are 12.3 meters and 3.7 meters. The angle between them is 99.3 degrees. What is the length of the third side?

12- Tan 21.92°

13- Suppose that your bathroom scale reads your mass as 77.4 kg with a 0.5% uncertainty. What is the uncertainty in your mass (in kilograms)?

14- The speed of sound is measured to be 338.3 m/s on a certain day.  What is this in km/h?

15- If the base of a certain ramp is 19.1 meters long, and its height is 4.9 meters, what is the angle in degrees of the incline?

I need only the answer of those question. i need the answer as fast as u can