Answer:
The correct answer will be:

Step-by-step explanation:
It is given that :
Initial temperature, 
Final temperature,

Time taken :

Change in temperature per hour:

Putting the values of temperatures and time:

The error done by Wen was during calculating the values of fraction.
So, the correct answer is :
instead of
so 21 - 13, the money will be invested for 8 years.

Answer:
1 =x-5 = as pytanerosa tery says
23
Step-by-step explanation:
Decimal form= 7.5 , fraction form = 15/2 , improper fraction= 7 and 1/2