Answer:
To find the sum of interior angles in a polygon, we can use the formula:
where n is the number of sides.
Since this is pentagon (5 sides), then 
The missing angle would then be

Since angles on a straight line add up to 180, then


I = PRT
983.25 = (3800)(R)(3.5)
983.25 = 13300R
983.25 / 13300 = R
0.07392 = R
7.39% = R <==
B. Geometric shapes with a black or black white black black
Answer:

Step-by-step explanation:
1. Expand by distributing sum groups.
2. Expand by distributing terms.

3.Expand by distributing terms.

4. Remove parentheses.

5. Collect like terms.

6. Simplify.

Thus. the answer is,

The answer (im pretty sure) is: 10 2/5