Answer:
The amount invested at 9% is $30,000
Step-by-step explanation:
Mardi received an inheritance of $40,000.
Let x be the amount invested at 9%.
So, Amount invested at 10% = 40000-x
Her total annual income from the investments was $3700.
So,
x=30000
Hence the amount invested at 9% is $30,000
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Volume of the cone:
V = 3.14 x 3^2 x 9/3 = 84.78
Volume of half sphere on top of cone:
V = (4/3 x 3.14 x 3^3 )/2 = 56.52
Total volume = 56.52 + 84.78 = 141.3 cm^3
