The given expression is

We can write 8 as cube of 2, 16 ad fourth power of 2, 12 as square of 2 times 3 and 81 as fourth power of 3, that is

In case of two powers, we have to multiply them.

Simplifying the exponent, will give

Combining like terms,

It is 20 if you plug in 5 for k
It is solved by unitary method.
Plz see the attachment....
26.8632hoped this helped.......
Part A:
[$25-( $0.50×22)]÷$2=n
Part B:
[$25-($0.50×22)]÷$2=n
[$25-($11)]÷$2=n
[$14]÷$2=n
7=n
Part C: Brandon purchased 7 meals last month.