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2 years ago

15

a runner warms up for ten minutes and then takes seven minutes to run each mile. the total time after r miles in 45 minutes. how

manymiles are run

1 answer:

Alika [10]2 years ago

6 0

45=10+7x
35=7x
5=x

Answer: they ran 5 miles

Hope this helps:)

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two men working together can complete a job in 1 hour 20 minutes. the first man working alone can complete the task in two hours

lana [24]

Answer:

Second Man = (2 Hours * 1.3333 Hours) / (2 Hours - 1.3333 Hours)

Second Man = (2.6666666667 ) / (.666666667)

Second Man (when working alone) = 4 Hours

Step-by-step explanation:

6 0

3 years ago

The large piston in a hydraulic lift has an area of 2m^2. What force must be applied to the small piston with an area of .2m^2 i

Helen [10]

Answer:

147,000N

Step-by-step explanation:

A1= 2m^2

A2= 0.2m^2

F2= 14,700N

Required

F1, the applied force

Applying the formula

F1/A1= F2/A2

substute

F1/2=14700/0.2

2*14700= F1*0.2

29400= F1*0.2

F1= 29400/0.2

F1=147,000N

Hence, the applied force is 147,000N

3 0

2 years ago

Find the value of (1/5)⁻² + (1/2)⁻³ + (1/4)⁻¹ <br><br><br><br>

evablogger [386]

Answer:

Answer = 37

Step-by-step explanation:

= (5)² + (2)³ + (4)¹

= 25 + 8 + 4

= 37 Answer

5 0

3 years ago

Read 2 more answers

Math question help pls

Ratling [72]

Answer:

B

........................

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2 years ago

A media poll of 500 air travelers surveyed in national airports found that 370 favor tighter security procedures in boarding pla

serg [7]

Answer:

92% Confidence interval: (0.7078,0.7722)

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 500

Number of travelers who favor tight security, x = 370

$\hat{p} = \dfrac{x}{n} = \dfrac{370}{500} = 0.74$

92% Confidence interval:

$\hat{p}\pm z_{stat}\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$

$z_{critical}\text{ at}~\alpha_{0.08} = \pm 1.645$

Putting the values, we get:

$0.74\pm 1.645(\sqrt{\dfrac{0.74(1-0.74)}{500}}) = 0.74\pm 0.0322\\\\=(0.7078,0.7722)$

3 0

3 years ago