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Math·Algebra·Linear functions

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The equation $d=6t+270$ gives the distance $d$, in feet, from a reference point on the surface of Mars to a Mars rover, where $t$ is the number of minutes after the start of a period of observation. By how many feet does the Mars rover’s distance from the reference point increase over a period of $20$ minutes?

A

390

B

290

C

120

D

6