Answer:
4 packages
Step-by-step explanation:
Hi,
1.25x + 6.50 = 11.50
1.25x = 5
x = 4
He bought 4 packages.
I hope this helps :)
Answer:
2) 68°
Step-by-step explanation:
The required answer is <u>68°</u>
The surface area of the balloon is
.
Differentiate both sides with respect to an arbitrary variable representing time:
Meanwhile, the volume of the balloon is
.
Differentiating with respect to
yields
You're told that, at the point when the radius
, the volume of the balloon increases at a rate of
, which means
. Use this to solve for the rate of change of the radius,
.
Substitute this into the equation for the rate of change of the surface area and solve for
.