Answer:
answer is A. cosine
Step-by-step explanation:
We know that formular for volume of pyramid=area of base ×height
the area of the base is 1/2×base×height
=1/2×15×14
=105cm²
the given volume is 270cm³
∴height=volume÷base area
=270cm³÷105cm²
=

=
The answer is 4x-1 hope it helps. :D