Find the instantaneous rate of change of the function at the given value

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For which rational expression is -2 an excluded value of x?

How do i put 3(x+7) in distributive property

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?