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Oliga [24]
2 years ago
12

The decimal $0.76$ is equal to the fraction $\frac{4b+19}{6b+11}$, where $b$ is a positive integer. What is the value of $b$?

Mathematics
1 answer:
Vadim26 [7]2 years ago
3 0

Answer:

The value of b is 19.

Step-by-step explanation:

With what the problem states, we have that:

\frac{4b + 19}{6b + 11} = 0.76

Doing cross multiplication

4b + 19 = 0.76(6b + 11)

4b + 19 = 4.56b + 8.36

4.56b - 4n = 19 - 8.36

0.56b = 10.64

b = \frac{10.64}{0.56}

b = 19

The value of b is 19.

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Whats the solution of <br> y = x +2 <br> 2x - 5y = 2
aleksandr82 [10.1K]

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2 years ago
Y=x^2 -9x at x = 4 Find an equation of the tangent an an equation of the normal
Montano1993 [528]

The tangent line to <em>y</em> = <em>f(x)</em> at a point (<em>a</em>, <em>f(a)</em> ) has slope d<em>y</em>/d<em>x</em> at <em>x</em> = <em>a</em>. So first compute the derivative:

<em>y</em> = <em>x</em>² - 9<em>x</em>   →   d<em>y</em>/d<em>x</em> = 2<em>x</em> - 9

When <em>x</em> = 4, the function takes on a value of

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Then use the point-slope formula to get the equation of the tangent line:

<em>y</em> - (-20) = -1 (<em>x</em> - 4)

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<em>y</em> = -<em>x</em> - 24

The normal line is perpendicular to the tangent, so its slope is -1/(-1) = 1. It passes through the same point, so its equation is

<em>y</em> - (-20) = 1 (<em>x</em> - 4)

<em>y</em> + 20 = <em>x</em> - 4

<em>y</em> = <em>x</em> - 24

3 0
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