A triangular prism has a base area of 7.3 cm and a volume of 71.54 cm. The height of the prism must be...

a. 3.65 cm
b. 7.3 cm
c. 9.8 cm
d. 19.6 cm

An explanation of the answer would be very much appreciated!

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post