Answer:
Option 2, (-3+8)/2
Step-by-step explanation:
Average: Sum of two numbers/ How many numbers
Sum: -3+8
Amount of Numbers: 2
(-3+8)/2
we are given

Firstly, we will simplify left side
and then we can solve for k
Left side is

we can arrange like terms



now, we can use property of exponent



now, we can equate it with right side
and we get

We can see that both sides have 30 , a and b
and they are equal
so, exponent of a must also be equal

now, we can solve for k

................Answer
If a=0, then the denominator is equal to 0. Since you cannot divide by zero, you are not allowed to do this.
Hope This helps!
Answer:19.2
Step-by-step explanation: