The number halfway between 200 and 300 is 250
two intersecting lines can only have 1 solution.
Volume of pyramid:

A - base area
H - height
First count volume of one pyramid:
![V=\dfrac{1}{3} \cdot 3 \cdot 4=4 [\hbox{inch}^3]](https://tex.z-dn.net/?f=V%3D%5Cdfrac%7B1%7D%7B3%7D%20%5Ccdot%203%20%5Ccdot%204%3D4%20%5B%5Chbox%7Binch%7D%5E3%5D)
So by using 576 inch^3 you can make 576 : 4 =
144 pyramids
The answer is
a) x° = 80
reasons) the reason is a line is 180°
the angle 100°
that would leave you 80° to make a straight line
i hope this helped :)