Answer:
B:b=-2
Step-by-step explanation:
Recallin that, the diameter is twice as long as the radius, namely the radius is half the diameter, so, if the diameter is doubled, the radius is also doubled.

notice, the new volume is 4 times (πr² h), namely 4 times the original.
X=0 I think the answer is , sorry if this isn’t correct
Answer:
y = 16
Step-by-step explanation:
Given that y varies directly as x then the equation relating them is
y = kx ← k is the constant of variation
To find k use the condition y = 48 when x = 6, thus
k =
=
= 8
y = 8x ← equation of variation
When x = 2, then
y = 8 × 2 = 16