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write and solve an inequality. on a trip from virginia to florida, the sampson family wants to travel at least 420 miles in 8 hours. what must be their average rate of speed?

  • algebra -

    rate = distance / time
    = 420/8 = 52.5 mph
    so any speed greater than that will give a distance greater than 420

    rate ≥ 420/8 would do it.

  • algebra -

    8x ≥ 420
    8x/8 ≥ 420/8
    x ≥ 52.5

    They would need to travel greater than or equal to 52.5 mpg to meet their expectations.

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