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Licemer1 [7]
2 years ago
6

Keith used the following steps to find the inverse of f, but he thinks he made a error

Mathematics
1 answer:
astra-53 [7]2 years ago
7 0

Answer:

Step-by-step explanation:

\Large \boldsymbol{} f(x)  \ \ inverse  \ \  function    \ \ (f(x))^{-1} \\\\ y=7x+5 \\\\x=7y+5 \\\\ y=\dfrac{x-5}{7}  \ \  or \  \  f(x)^{-1}= \dfrac{x-5}{7}

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Can someone help me with this question please!!!!!
faltersainse [42]
From the equation, it looks like we can set up a triangle like this.  One side is x and the other is x + 20 because the northbound car traveled 20 miles farther.  The hypotenuse is 100 because they were 100 miles apart.

Next, we can use the Pythagorean Theorem to solve for x:

a² + b² = c²
x² + (x + 20)² = 100²

This simplifies to:

x² + x² + 40x + 400 = 10000
2x² + 40x = 9600
2x² + 40x - 9600 = 0

After that, we can divided each side by 2:

x² + 20x - 4800 = 0

Next, we have to factor:

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x = 60, -80

Since we know that distance can't be negative, 60 is the valid answer in this case.

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3 years ago
Answer<br> (5.2 + 6.3) - 12 ÷ 2.5
sweet [91]

Answer:

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Step-by-step explanation:

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3 years ago
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Bogdan [553]
One because it only has one number behind the decimal
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Answer:

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Step-by-step explanation:

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