Answer:

Step-by-step explanation:
we know that
The volume of the triangular prism of the figure is equal to

where
B is the area of the triangular base
h is the height of the triangular prism
Find the value of B

we have that

substitute the values and solve for h


Original is 100
1/4 off is 25 off
75 left
10% what's left is 75-7.5=67.5
this was already out of 100
100=67.5=32.5
1/4 off and then 10% off is the same as 32.5% discount
73+42 is correct because it’s addition