Find the sum of all the integers between -14 to 8

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Based on what i know about mean, this doesn't add up.

The table respent two linear functions the equation respented by the first tables is given

Someone answer asap for ! michele pushes a box d meters across a floor. she uses a force f, in newtons, to push the box. she pushes the box for t seconds. the formula p = fd/t calculates the power, p, in watts, that it takes for michele to complete the task. solve the formula for d.