The decimal for this would be 7.575
Hope this helped :)
The question is worded a bit strangely (in my opinion anyway), but I think your teacher wants you to describe how exponents work.
Let's say we had the expression 
The base is 5 as its the bottom most value (think of something like the base of a tree or building). The exponent is 3.
The exponent of 3 tells the reader to multiply the base 5 by itself 3 times like so

With larger exponents, it becomes more tedious to write out all the repeated multiplications, which is why many calculators have an exponent button to save time.
Answer:
18
Step-by-step explanation:
Hope this helps!
Answer:
16
Step-by-step explanation:
because juan is spend 28 on gift and he added a 16 .
Answer:
1. <
2. <
Step-by-step explanation:
Have a good day :)