Need help with this simplify square roots problem, please show work :)

4b√5

Step-by-step explanation:

√80b^2

=√(4×4×5)(b)^2

=4b√5. {cuz,square root of x^2 is x, so}

✌️:)

Here,

√80b^2

=√2×2×2×2×5×b×b

=4b√5

HOPE IT HELPS!!!

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)