Answer:
First picture - 20.42 m
Second picture - 12.9 m
Step-by-step explanation:
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Formula for pyramid:

Where,
b = base - 3.5 m
h = height - 5 m
Thus,

≈ 
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Formula for pyramid:

Where,
b = base - 3 m
h = height - 4.3 m
Thus,


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<u><em>Kavinsky</em></u>
Simplify
-0.75x + 8 + 1.5x + 4.4
Collect like terms
(-0.75x + 1.5x) + (8 + 4.4)
Simplify
<u>0.75x + 12.4 </u>
X=12
0.75x + 5=14
Take away 5 on both sides
So 0.75x +5-5=14-5
0.75x=9
0.75x divided by 9 = 12