The diagram shows a triangle.

What is the value of w?

Remember that the angles in a triangle add to 180 degrees. So, to solve, you add the two angles you have and subtract that difference from 180.

w=32

Step-by-step explanation:

33+115+w=180

148+w=180

w=180-148

w=32

Total = Principal * e ^ (rate*years)
where "e" is the mathematical constant 2.718281828459
This can't be answered because you didn't state the rate.

If the rate is 1 per cent then:
Total = Principal * e ^ (.01*15)
Total = Principal * e ^ .15
Total = 100.00 * e ^ .15
Total = 100.00 * 1.1618342427
Total = 116.18

If the rate is 12 per cent then:
Total = Principal * e ^ (.12*15)
Total = 100 * e^1.8
Total = 100 * 6.0496474644
Total = 604.96

Source:
http://www.1728.org/rate2.htm