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Alexxx [7]
3 years ago
9

How many two digit numbers do not contain the digit 9?

Mathematics
1 answer:
cricket20 [7]3 years ago
5 0
87 numbers do not contain the digit 9
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What’s the range of the function fix)=4x+9, given the domain D={-4,-2,0,2}?
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The range is all real numbers.

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I graphed the equation on the graph below to find the range. The range is all real numbers because the line never stops and it touches all possible y-values.

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kolezko [41]

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Let f(x) = x^2 + 4x - 31. for what value of a is there exactly one real value of x such that f(x) = a?
allsm [11]
This value of "a" is exactly the y-coordinate of the vertex of the parabola
y = x%5E2+%2B+4x++-+31.

To find it, complete the square:

x%5E2+%2B+4x++-+31 = %28x%2B2%29%5E2+-+4+-+31 = %28x%2B2%29%5E2+-+35.

So, this value of "a" is a = -35.










Figure. Plot y = x%5E2+%2B+4x++-+31.


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3 years ago
I don’t understand- due tomorrow please help ASAP
Mashutka [201]
For which one I might be able to help
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