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15. 5
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21)
Height of well = 8m
Diameter of well = 14m
So, radius of well = 7m
Earth dug out = Volume of well
→ πr²h
→ 3.14 x (7)² x (8)
→ 1231.5 m³
•Now, volume dug out = volume of field
→ 1231.5 = l x b x h
→ 1231.5 = 10 x 8 x h
→ h = 1231.5/80
→ h = 15.4 m _________(Ans.)
Option B) 15.4m CORRECT
22) This one is below...
→ 5^(3x+4) = 25 x 5^(4x - 1)
→ 5^(3x+4) = 5² x 5^(4x - 1)
→ 5^(3x+4) = 5^(2 + 4x - 1)
→ 5^(3x+4) = 5^(4x+1)
Both have same base, so compute their powers
→ 3x + 4 = 4x + 1
→ 4x - 3x = 4 - 1
→ x = 3 ____________(Ans.)
Hope it helps....!
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