After using the property of power, the expressions as a power of the number a is
,
and
.
In the given question we have to solve the given expressions as a power of the number a where a≠0.
The first given expression is
.
Using the property of multiplication of power;
.
Simplifying the expression.


The second expression is 
Using the property of multiplication of power;
.


Using the property of sum of power 


The third expression is
.
Using the property of multiplication of power;
.


Again using the property of multiplication of power;
.


To learn more about property of power link is here
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There are different types of parallelograms,and you probably have the notes determining what type it is. So like it could be a square, rectangle, rhombus..
just move the 15 the left and divide 5 and u should get c=3