A particle moves so that it is at $(2t + 7, 4t - 13)$ at time $t.$  Find the speed of the particle, measured in unit of distance per unit of time.
Question:
A particle moves so that it is at $(2t + 7, 4t - 13)$ at time $t.$  Find the speed of the particle, measured in unit of distance per unit of time.
Answer:
Let's think step by step.

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2 \sqrt{5}
A particle moves so that it is at $(2t + 7, 4t - 13)$ at time $t.$  Find the speed of the particle, measured in unit of distance per unit of time.
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