2 years ago

The owner of a pet store sells 5 goldfish for $9 . What is the cost in dollars for one goldfish

Mathematics

2 answers:

nexus9112 [7]2 years ago

7 0

$1.80 is the correct answer

Simora [160]2 years ago

6 0

Answer:

The answer is C.

Step-by-step explanation:

Took the lesson on edge 2021

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Bezzdna [24]

Think of the two pieces together as a single cone of height 19, and its volume.
Then think of only the upper piece as a cone, and find its volume.
The volume of the frustum is the total volume minus the volume of the upper piece.

The volume of a cone is:

$V = \dfrac{1}{3} \pi r^2 h$

Total volume:

$V_t = \dfrac{1}{3} \times \pi \times 7.5^2 \times 19$

Volume of upper cone:

$V_u = \dfrac{1}{3} \times \pi \times 3.5^2 \times 8$

Volume of frustum:

$V_f = \dfrac{1}{3}\pi(7.5^2)(19) - \dfrac{1}{3}\pi(3.5^2)(8)$

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