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4 years ago

Drove 300 miles it took her 6 hours what was her average speed

Mathematics

1 answer:

ICE Princess25 [194]4 years ago

8 0

I think it’s between 50-55

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Jonathon and Samantha row their canoe 28 miles downstream in 2 hours. After a picnic, they row back upstream. After 3 hours the

dangina [55]

Answer: the speed at which Jonathon and Samantha can row in still water is 9 mph

Step-by-step explanation:

Let x represent the speed of the canoe in still water.

Let y represent the speed of the river's current.

Jonathon and Samantha row their canoe 28 miles downstream in 2 hours. Assuming they rowed with the current, the total speed would be (x + y) mph

Distance = speed × time

Distance travelled downstream is expressed as

28 = 2(x + y)

Dividing through by 2, it becomes

14 = x + y - - - - - - - -1

After a picnic, they row back upstream. After 3 hours they only travel 12 miles. Assuming they rowed against the current, the total speed would be (x - y) mph

Distance travelled upstream is expressed as

12 = 3(x - y)

Dividing through by 3, it becomes

4 = x - y - - - - - - - -2

Adding equation 1 and equation 2, it becomes

18 = 2y

y = 18/2

y = 9 mph

8 0

3 years ago

How to figure out proportions

juin [17]

i thibfergghgearsssgggga. dddyssxxv d xxx can find different

6 0

3 years ago

Tracy ran a lap around the school track in 74.2 seconds.Malcom ran a lap in 65.92 seconds. Estimate the difference in the times

Nataly_w [17]

Answer:

The difference would be 8.3 second

Step-by-step explanation:

5 0

3 years ago

Symify 9 to the 2 power / 9 to the 7 power

fenix001 [56]

9514 1404 393

Answer:

1/9^5

Step-by-step explanation:

$\dfrac{9^2}{9^7}=\dfrac{9\cdot 9}{9\cdot 9\cdot 9\cdot 9\cdot 9\cdot 9\cdot 9}=\dfrac{1}{9\cdot 9\cdot 9\cdot 9\cdot 9}=\boxed{\dfrac{1}{9^5}}$

_____

An exponent is an indicator of repeated multiplication. As you can see, factors in the numerator cancel those in the denominator, so the result is the difference of the exponents.

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3 years ago

Three phones in a shipment of eighteen are known to be broken. A randomly selected phone is removed from the shipment and tested

statuscvo [17]

Answer:

$\frac{14}{17}$

Step-by-step explanation:

Number of phones broken = 3

Number of phones not broken = 15

Total number of phone in the shipment = 18

Since a not broken phone has been randomly selected, the number of phones not broken reduces to 14. And the total number of phones would be 17.

Pr(of newly selected phone NOT broken) = $\frac{number of not broken phones}{total number of phones}$

= $\frac{14}{17}$

Therefore, the probability of the selected phone not being broken is $\frac{14}{17}$ .

5 0

3 years ago