S=d/t so in this case it's 75/12 which is 6.25. Round it and you got 6 miles per hour.
I got 5 times 45 because I multiplied by 5 to get my answer.
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Okay first set up the equation
x
--- -2 = 5.5
-3
add over the 2
x
--- = 7.5
-3
now you need to multiply the denominator by the answer
(-3)(7.5) = x
-22.5 = x