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Rina8888 [55]
3 years ago
14

Give an example of an open equation? my answer is, x + 4 = 7 Until the value of x is found, it is unknown whether the equation i

s true or false. am i right?
Mathematics
1 answer:
Sphinxa [80]3 years ago
8 0
Yes you’re right you cannot know if the equation is true or false
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What is the value of 9x^2 + 13x – 15, if x = 2
Paladinen [302]

Step-by-step explanation:

Given,

9 {x}^{2}  + 13x - 15

and

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Substitute x = 2 into expression.

9 {x}^{2}  + 13x - 15 = 9( {2}^{2} ) + 13(2) - 15 \\  = 9(4) + 26 - 15 \\  = 36 + 26 - 15 \\  = 62 - 15 \\  = 47

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3 years ago
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What is the mean median mode and range of the numbers 31 28 30 31 30 ...?
mamaluj [8]
1. Mean is the number you get when you add all these numbers and then divide by the number of numbers. So, (31 + 28 + 30 + 31 + 30) / 5 = 150 / 5 = 30
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