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3 years ago

Which of the following sets shows all the numbers from the set {1, 2.5, 3, 4.5, 5} that make the inequality 3a + 4 ≥ 13 true?

2 answers:

3 0

3(1)+4≥ 13
7≥ 13
No

3(2.5)+4≥ 13
11.5≥ 13
No

3(3)+4≥ 13
13≥ 13
Yes

{3, 4.5, 5}

Slav-nsk [51]3 years ago

3 0

Answer:

[3, 4.5, 5] :D

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

Let d = distance (in miles)

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Using: distance = speed x time

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$\implies t=\dfrac{18}{v} \ \ \textsf{and} \ \ t=\dfrac{18}{v+15}$

We are told that the total driving time is 1 hour, so the sum of these expressions equals 1 hour:

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Now all we have to do is solve the equation for v:

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$\implies v=30, v=-9$

As v is positive, v = 30 only

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(and the average speed driving from the airport was 45 mph)

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