First off, nicely done on the exponents. You'd be surprised on how bad some look ,:D
a)

b)
Answer: 81
since it's the 4th power then you do 3x3x3x3= 81
Step-by-step explanation:
The answer should be 7x+28
I Hope this Helps!
2/8 of an hour is 15,and 2/6 of an hour is 20 minutes. 20-15 is 5 minutes
Answer:

Step-by-step explanation:
Start by making the denominators of both fraction the same. This can be done by multiplying one fraction's denominator by the other.
After simplifying and combining the two fractions together, check if the numerator can be factorised such that there is a common factor in the denominator and numerator. In this case, the numerator cannot be factorised.
Lastly, expand the denominator.





