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Alina [70]
2 years ago
12

The square of a certain number plus ten is equal to 81​

Mathematics
1 answer:
Scorpion4ik [409]2 years ago
3 0

Answer:

x = ±8.43 (to 3sf)

Step-by-step explanation:

Let this number be x.

x² + 10 = 81

      x² = 81 - 10

           = 71

        x = ±√71

           = ±8.43 (to 3sf)

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ratelena [41]

Answer: See explanation

Step-by-step explanation:

Your question isn't really clear. Let me help you rephrase it and solve.

Let's say Cesar is creating a schedule to practice his instrument for band. He needs to practice for a total of 10 hours in a week. On Monday he practice for 1 1/2 hours, on Tuesday he practiced for 2 1/4 hours, and on Wednesday he practiced for 1 1/2 hours.

The total hours that Cesar has used in practicing will be:

= 1 1/2 + 2 1/4 + 1 1/2

= 5 1/4

To get the number of hours that Cesar need to practice during the rest of the week in order to have his 10 total hours, we subtract 5 1/4 hours from 10 hours. This will be:

= 10 - 5 1/4

= 4 3/4 hours.

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5 0
3 years ago
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Answer:

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Step-by-step explanation:


5 0
3 years ago
Which function is the same as y=cos(2(x+pi/2))-2
miss Akunina [59]
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Ursula wrote the sum 5.815 +6.021 as a sum of two mixed numbers.<br> What a sum did she write?
enot [183]
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Explanation:
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3 years ago
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