3 years ago

Solve 3x - 7 ≥ 14, then plot the solution on the number line. please help me

Mathematics

1 answer:

sergey [27]3 years ago

5 0

Answer:

Step-by-step explanation:

$3x-7\ge 14\\ \\ 3x\ge 21\\ \\ x\ge 7\\ \\ \text{The graph will be shaded from the x=7 vertical line and rightward to infinity.}$

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4 years ago

A commuter has to cross a train track each day on the way to work. The probability of having to wait for a train is .2. If she h

Anni [7]

Answer:

21 minutes

Step-by-step explanation:

Her expected commute time is given by the probability of having to wait for the train (0.2) multiplied by the commute time in this scenario (25 min), added to the probability of not having to wait for the train (1 - 0.2) multiplied by the commute time in this scenario (20 min). The expected commute time is:

$E(X) = 0.2*25+(1-0.2)*20\\E(X) = 21\ minutes$