He had 5 friends to share it the 12 1/2 pounds. 12 1/2 divided into 5 is 2 1/2
Answer:
dV/dt = 13,5 [Km³/h]
Step-by-step explanation:
The volume f the cube is:
V = x³ where x is a side of the cube, then tacking derivatives with respect to time on both sides of the equation
dV/dt = 3*x² dx/dt
dx/dt = 2 km/h
at the time when the side x = 1,5 Km
dV/dt = 3* (1,5)²*2 [km³/h]
dV/dt = 13,5 [Km³/h]
You can use the Pythagoras theorem to get the value of x.
The value of x is given by
Option C: x = 6.2
<h3>What is Pythagoras theorem?</h3>
The Pythagoras theorem:
If ABC is a triangle with AC as the hypotenuse and angle B with 90 degrees then we have:

<h3>Using the above theorem to find the value of x for the given figure</h3>
Refer to the figure attached below.
The triangle BAD is right angled triangle (one angle is 90 degrees).
The length of CD is 13 - x units.
Thus, we have:

For triangle ACD, we have:

For triangle ACB, we have;

Thus,
The value of x is given by
Option C: x = 6.2
Learn more about Pythagoras theorem here:
brainly.com/question/12790596
It results in -2x because 1+1=2 and its the same with negative numbers