You can easily find the answer by looking in Einstien and his famous work.
Answer:

Step-by-step explanation:
To find the average rate of change, we use the formula

Where
and 
Knowing this, we can plug in all of our know values and simplify.

100=P(1+0.05)^10
P=100/(1.05)^10
P=61.39
Answer:
x = 98
Step-by-step explanation:
If angle D is the center then
x + 4 = 2 × (x - 47)
x + 4 = 2x - 94
4 + 94 = 2x - x
98 = x