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9966 [12]
3 years ago
13

At the local pet store, zebra fish cost $2.00 each and neon tetras cost $1.90 each. If Ernesto bought 11 fish for a total cost o

f $21.50, not including tax, how many of each type of fish did he buy?
Mathematics
1 answer:
zaharov [31]3 years ago
4 0

Answer:Break it into 2 shapes.

A rectangle: 8 x 7 = 56 square inches.

A triangle: 1/2 x 3 x 4 = 6 square inches.

Total: 56 + 6 = 62 square inches.

Step-by-step explanation:

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An engineer is planning a new water pipe installation. The circular pipe has a diameter of d=20\text{ cm}d=20 cmd, equals, 20, s
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Answer: The answer is 314.28 cm² (approx.).


Step-by-step explanation:  Given that an engineer is going to install a new water pipe. The diameter of this circular pipe is, d = 20 cm.

We need to find the area 'A' of the circular cross-section of the pipe.

Given, diameter of the circular section is

\textup{d}=20~\textup{cm}.

So, the radius of the circular cross-section will be

\textup{r}=\dfrac{\textup{d}}{2}=\dfrac{20}{2}=10~\textup{cm}.

Therefore, cross-sectional area of the pipe is

\textup{A}=\pi \textup{r}^2=\dfrac{22}{7}(10)^2=\dfrac{2200}{7}=314\dfrac{2}{7}=314.28~.~.~.~\textup{cm}^2.

Thus, the answer is 314.28 cm² (approx.).

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