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mixas84 [53]
3 years ago
11

Explain how 9*4 can help you find 9*8

Mathematics
2 answers:
statuscvo [17]3 years ago
4 0
It can help because 9×4 =36, and 9×8=72. if you divide 72 by 2 you get 36 which is the answer to 9 ×4. basically because nine is the same in both problems you are multiplying by 4 (and you know 4 is half of 8) you can assume that multiplying the sum of 4 and 9 that you will get the sum of 8 and 9.
Troyanec [42]3 years ago
4 0
Because 9*4=36 and 4 is half of 8 so you need to multiply 36*2 and you get 72 and 9*8=72
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We have f(x)=\dfrac{x+5}{3x-1}.

To find inverse function f^{-1}(x) we substitute x with f^{-1}(x) and vice-versa to get

x=\dfrac{f^{-1}(x)+5}{3f^{-1}(x)-1}

Now solve for f^{-1}(x). Note that I will use j instead.

x=\dfrac{j+5}{3j-1} \\x(3j-1)=j+5 \\3jx-x=j+5 \\3jx-x-j-5=0 \\3jx-j=x+5 \\j(3x-1)=x+5 \\j=\dfrac{x+5}{3x-1}

So we find that f(x)=f^{-1}.

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3 years ago
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  x² + 50

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= \sqrt{x^{2} } +/- \sqrt{-50}            Side note: \sqrt{-50} = \sqrt{(-1) * 5 * 5} = 5i

= (x + 5i)(x - 5i)

8 0
4 years ago
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Mrs. Lawson made 18 sandwiches for the trip. She planned that each person would eat 1/2 a sandwich. How many people can she feed
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X = 2 y = 3 z = 4
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95

Step-by-step explanation:

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2 years ago
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The sample space is the set of all the possible outcomes of a given experiment.

Here, our experiment consists on:

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Followed by spinning a spinner with 3 sections labeled 1, 2 and 3 (3 outcomes).

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