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katrin2010 [14]
3 years ago
11

Write an equation and solve. Round to the nearest hundredth where necessary. 19 is what percent of 40?

Mathematics
2 answers:
Ksju [112]3 years ago
5 0
The first one is B. idk the second


olya-2409 [2.1K]3 years ago
4 0

Step-by-step explanation:

(a) Let x% of 40 = 19

Therefore, \frac{x}{100} \times 40 = 19

                 \frac{4x}{10} = 19

                     x = \frac{190}{4}

                     x = 47.5

Thus, 47.5% of 40 = 19.


(b) It is given that \frac{5}{x} = \frac{4}{8}

                             x = \frac{5 \times 8}{4}

                                    x = 10

Thus, we can conclude that the value of x = 10.


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The diameter of a iron sphere is 8 cm. It is beaten and drawn into a wire with a diameter of 2 mm. Find the length of the wire.
djyliett [7]

Answer : The length of the wire is, 8533 cm

Step-by-step explanation :

As the iron sphere is beaten and drawn into a wire. That means, their volume will be equal.

Volume of iron sphere = Volume of cylindrical wire

The formula will be:

\frac{4}{3}\pi r_1^3=\pi r_2^2h

where,

r_1 = radius of sphere = \frac{Diamtere}{2}=\frac{8cm}{2}=4cm

r_2 = radius of cylindrical wire = \frac{Diamtere}{2}=\frac{2mm}{2}=1mm=0.1cm

h = height of cylindrical wire or length of wire

Now put all the given values in the above formula, we get:

\frac{4}{3}\pi r_1^3=\pi r_2^2h

\frac{4}{3}\times r_1^3=r_2^2h

\frac{4}{3}\times (4)^3=(0.1)^2h

h=8533.33cm\approx 8533cm

Therefore, the length of the wire is, 8533 cm

6 0
3 years ago
I NEED HELP PLS
Alisiya [41]

Answer:

114.5 in³

Step-by-step explanation:

Volume of cone:

⅓ × 3.14 × 8² × 12

= 803.84 cm³

Volume of hemisphere:

⅔ × 3.14 × 8³

= 1071.786667 cm³

Total = 803.84 + 1071.786667

= 1875.626667 cm³

1 cm = 0.393701 inches

1 cm³ = 0.393701³ inches

Volume in in³:

1875.786667/0.393701³

= 114.4579471 in³

7 0
3 years ago
Help on this question.....
HACTEHA [7]

Answer:

25

Step-by-step explanation:

17 / 0.68 = 25

check your answer?

25 * 0.68 = 17

:)

3 0
2 years ago
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(12 + 3) - 7 = N ineed an aswer pls​
KIM [24]

Step-by-step explanation:

N=8

that is the answer

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3 0
3 years ago
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What is the decimal of 72/80
djyliett [7]

Answer:

0.9

Step-by-step explanation:

3 0
3 years ago
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