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sweet-ann [11.9K]
3 years ago
7

What is the difference in time between crossing a bridge that is 2,737 meters long at an average speed of 322 meters per minute

and in crossing the same bridge at an average speed of 80 meters per minute?
Mathematics
1 answer:
egoroff_w [7]3 years ago
3 0

so the bridge is 2737 meters long.

at a speed of 322 m/min, meaning for for every passing minute, there are 322 meters covered, so we can simply divide 2737/322 to get a "minute" amount, namely 8.5, at 322 m/min, it takes 8.5 minutes to cross it.

now, if we instead are going slower, at 80 m/min, 80 meters to a minute, then it'll be 2737/80 minutes, namely 34.2125.

their time difference is 34.2125 - 8.5  = 25.7125 minutes, so about 25 minutes and 43 seconds.

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2x + y = 3
sergejj [24]

Hey there!

First, multiply the second equation by -2 as the problem states. When you multiply the second equation by -2, you get:

-2x+4y=2

Now, add this equation to the first equation in which you simply combine like terms:

2x+y=3

+

-2x+4y=2

=

5y= 5

In conclusion, the correct answer would be the first choice.

4 0
3 years ago
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As part of a company incentive, each sales person that sells over \$40{,}000$40,000dollar sign, 40, comma, 000 in merchandise th
worty [1.4K]

Answer:

$58,600

Step-by-step explanation:

Data provided in the question:

Commission on Sales upto and including $40,000 = 5%

Commission on Sales above $40,000 = 10%

Total commission = $3,860

Now,

For sales of $40,000

maximum commission = 5% of $40,000

= $2,000

Since the commission received is greater than $2,000

Therefore,

The value of s is greater than $40,000

Thus

Amount qualifying for 10% commission = s - $40,000

therefore,

Total commission = $2,000 + 10% of (s - $40,000)

or

$3,860 =  $2,000 + 0.10 × (s - $40,000)

or

$1,860 = 0.10 × (s - $40,000)

or

s - $40,000 = $18,600

or

s = $18,600 + $40,000

or

s = $58,600

4 0
3 years ago
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A meal at a restaurant costs $49.28. If the customers leave $8.23 for a tip, determine the tip rate to the nearest whole percent
Ede4ka [16]
The cost for the total meal, I think, is $58. If you add 49.28 and 8.23, you get 57.51. I rounded to the nearest one and I got 58, so thats the answer I got. Hope this helps!
5 0
3 years ago
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Tobias dropped a tennis ball from a height of 60 meters. The time in seconds it takes for the ball to fall 60 feet is 0.25(radic
AnnZ [28]

We are given

Tobias dropped a tennis ball from a height of 60 meters. The time in seconds it takes for the ball to fall 60 feet is 0.25(radical60).

so, time is

T=0.25\sqrt{60} =\frac{1}{4} \sqrt{60}

we have to approximate it's value

First approximation set:

we know that

49

we can take sqrt all the sides

\sqrt{49}

we can simplify it

7

Divide all sides by 4

\frac{7}{4}< \frac{1}{4} \sqrt{60}

Second approximation set:

7.7

Divide all sides by 4

\frac{7.7}{4}

1.925

Third approximation set:

7.74

Divide all sides by 4

\frac{7.74}{4}

1.935

so, we get

t=1.94seconds......Answer

7 0
3 years ago
A barrel had 20 liters of water. Water leaked out from the barrel at a constant rate. After 24 hours, 14 liters of water was lef
disa [49]
20-14=6
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8 0
3 years ago
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