66,000*0.15
9,900*5
49,500+66000
The answer is 115.500
I'm not sure if the whole thing is correct, but here is the easier way:
66,000(1+1.15)^5
He needs 420 to buy a new smartphone and accessories.
75-495= 420
420+75= 495
<u>Answer-</u>
<em>The exponential function that satisfies the given conditions is
</em>
<u>Solution-</u>
This can be represented as exponential decreasing function,

Where,
-
a = starting amount = 67
- r = rate = 0.47% = 0.0047
- t = week
Putting the values,


Therefore, the exponential function that satisfies the given conditions is

15.8 as the square root of (13^2+9^2) is less then the square root of (10^2+14^2) you can do this by using the Pythagorean Theorem.