Answer:
don't know maybe 60
Step-by-step explanation:
Idk
To convert a mixed fraction into an improper fraction:

Answer:
, 
Step-by-step explanation:
The velocity function of the projectile is obtained by deriving the position function:

Now, the velocities after 3 and 15 seconds are, respectively:




The significant components, the radius and the height, are in inches and feet respectively, you'd need to convert them both to the same unit, whichever it may be, meters or feet or inches or millimeters, so long is the same, then use the volume of a cylinder equation to get it.
A exponent is the smaller number you will see sometimes on the top of a number or to the right of it but smaller than normal font