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sashaice [31]
3 years ago
6

Help me please WITH NUMBER 7

Mathematics
1 answer:
Eva8 [605]3 years ago
6 0
7a)
x - 10 + x - 11 + 3x + 6 = 180
5x -15 = 180
5x = 195
  x = 39

7b)
y = 3x + 6
y = 3(39) +6
y = 117 + 6
y = 123
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48

Step-by-step explanation:

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they threw in the angel to confuse you

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9^{x - 1} = 27 \\ln(9^{x - 1}) = ln(27) \\(x - 1)ln(9) = ln(27) \\x - 1 = \frac{ln(27)}{ln(9)} \\x = \frac{ln(27)}{ln(9)} + 1 \\x = 2.5

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Deffense [45]
<h3>Answer:  x^2 + y^2 = 40</h3>

==========================================================

Explanation:

The center is the origin, so (h,k) = (0,0).

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(x-h)^2 + (y-k)^2 = r^2

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------------------

Since h = 0, k = 0, and r^2 = 40, we can say:

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3 years ago
A quadratic equation is shown below: x2 − 8x + 13 = 0 Which of the following is the first correct step to write the above equati
Andreyy89

Answer:

<u>Add 3 to both sides of the equation</u>

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The first step is to basically realize that all it's asking you to do is to find a way to make the expression on the left (x^2  - 8x + 13) into an expression that is a perfect square. So what number should you add to both sides such that x^2 - 8x  + (13 + j) can be factored into (x-p)^2 ? Well, we can approach it like this:

Since (x-p)^2 can be turned into x^2 -2px + p^2, and our original form was x^2 - 8x  + (13 + j), we quickly realize that -2px = -8x. From there, we can easily tell that p = 4

Plug this into our last value p^2 to get 16. Therefore, if we compare this with our original equation again x^2 - 8x  + (13 + j), we notice that 13 + j = 16.

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