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3 years ago

Please help me, i only have 30 minutes!

Mathematics

2 answers:

Alex3 years ago

8 0

<h3>Solution:</h3>

Radius = Diameter ÷ 2 = 13 ÷ 2 = 6.5 cm

Circumference = 2πr

→ Circumference = 2 × π × 6.5

→ Circumference = 13 π cm

Therefore, circumference of given circle = 13 π cm

Hope it helps you :)

dolphi86 [110]3 years ago

6 0

Answer:

Radius= 13÷2

= 6.5

c= 2πr
2×22/7×6.5
40.85cm

Step-by-step explanation:

Hope that helps

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NO!
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4 years ago

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3 years ago

24. A tank can be filled by a pipe in 30 minutes and emptied by another pipe in 50 minutes. How many minutes will it take to fil

OleMash [197]

Answer:

75 minutes

Step-by-step explanation:

The rate at which the tank is filled up, F, and emptied, E, are respectively:

$F=\frac{V}{30}*60 = 2V/hour\\E=\frac{V}{50}*60 = 1.2V/hour$

Since V is the full volume of the tank, the time required to fill the tank if both pipes are open is given by:

$F-E=2V/hour-1.2V/hour = 0.8V/hour\\t= \frac{1}{0.8}=1.25\ hours = 75\ minutes$

It will take 75 minutes to fill the tank if both pipes are open.

4 0

3 years ago

Can someone plz help me dm me if u can help me with my math

lions [1.4K]

Do you still need help ?

3 0

3 years ago

How I can answer this question, NO LINKS, if you answer correctly I will give u brainliest!

larisa [96]

$\huge \bf༆ Answer ༄$

Let's solve this using unitary method ~

$\sf3 \: seconds = 63 \: meters$

$\sf1\: second= 63 \div 3 \: meters$

$\sf1\: second= 21 \: meters$

$\sf5\: seconds= 21 \times 5 \: meters$

$\sf5\: seconds= 105 \: meters$

Therefore , the ostrich will run 105 meters in 5 seconds.

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3 years ago