256 units squared
explanation:
Multiply 8 x 4 x 4 x 2
You will get your answer’
Y - 4 = -3x + 9
y = -3x + 13
standard form: 3x + y = 13
As the diameter is 18, a radius is half the diamater ergo the radius is 9.
Use the circumference formula:

So, adapted it would be:
2 * π * 9 which would be 56.7.
The circumference is 57m.
Hope this helps!
It looks like they're multiplied, then you can simply add the exponents,
b⁸ * b⁴ = b⁸⁺⁴ = b¹²
remember, b⁸=b*b*b*b*b*b*b*b and b⁴=b*b*b*b
so b⁸ * b⁴ = b*b*b*b*b*b*b*b * b*b*b*b = b¹²