Given brainliest answer

B

Step-by-step explanation:

Read carefully to the question. Since it says that the piano costs $4000 and loses 15% then it has to be B because the key word in the problem is loses and loses means subtraction.

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v = 1/3 a^2h

step-by-step explanation:

if the height is 57.7cm and the height of the slant edge is 18.2cm, then the volume is 1/3 a^2h.