Answer:
252<em>π</em> or 791.7 mm³/h
Step-by-step explanation:
The volume of a cylinder is given by

We desire to find the volume rate, that is,

<em>dr/dt</em> is the rate of change of the radius which is 7 mm/h.
<em>dV/dr</em> is derived by differentiating the volume equation, yielding

At <em>r</em> = 12 mm and <em>h</em> = 1.5 mm,

Answer:

Explanation:
[ Step One ] Group Like Terms

[ Step Two ] Combine Similar Elements: 

[ Step Three ] Expand 

[ Step Four ] Add 15 To Both Sides

[ Step Five ] Simplify

[ Step Six ] Subtract 10x From Both Sides

[ Step Seven ] Simplify

[
]
➤ 

Answer:
A boat would need 21 liters to cover the distance of 84 km.
Step-by-step explanation:
Given
A boat can travel 496 km on 124 liters of fuel.
To determine
How much fuel will it need to go 84 km?
It is stated that:
Distance covered in 124 liters of fuel = 496 km
Thus,
Unit rate = 496 km / 124 liters
= 4 km per liter
Thus,
The distance covered in 1 liter = 4km
In order to determine the distance covered in 84 km, all we need is to divide 84 km by 4.
i.e.
The fuel needed to go 84 km = 84 / 4 = 21 liters
Therefore, a boat would need 21 liters to cover the distance of 84 km.
X=7.5 area= 42
You know that the total perimeter is 39 so to find x you need to add what you already have. You’ll find there are 3 sides you don’t know the length of and all you have to do is find the shorter one which is basically 9-7=2 then add everything together and subtract it from 39 then divide it by 2 to find the two sides left
Answer:
It's number three, I'm sure.

Step-by-step explanation: