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3 years ago

Find each product (n-6)(n+6)

Mathematics

1 answer:

Brilliant_brown [7]3 years ago

3 0

Answer:

n squared - 10n + 24

Step-by-step explanation:

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Vicky records the low temperature for three consecutive days. Between the first and second days the temperature increased 6 degr

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Two trains move between two towns. It takes the first train 2 hr 48 min and it takes the second 4 hr 40 min. The rate of the fir

Umnica [9.8K]

Answer:

182 miles.

Step-by-step explanation:

Given:

Two trains move between two towns.

Time taken by first train = 2 hr 48 minutes =

Change minute into hour:

60 minute = 1 hour

1 minute = $\frac{1}{60}$

48 minutes = $\frac{1}{60}\times48=\frac{48}{60} =0.8\ hour$

Time taken by first train in hour = $2+0.8=2.8\ hours$

Time taken by second train = 4 hr 40 minutes

Similarly, 40 minutes = $\frac{40}{60} =0.67\ hour$

Time taken by second train in hour = $4+0.67=4.67\ hours$

The rate of the first train is 26 mph more than that of the second train.

Question asked:

What is the distance between these towns ?

Solution:

Let speed of second train = $x\ miles\ per\ hour$

<u>As the speed of the first train is 26 mph more than that of the second train. </u>

Speed of first train = $26+x\ miles\ per\ hour$

As two trains move between two towns means distance traveled by both train is same.

By using : $Distance=speed\times time$

Distance traveled by first train = Distance traveled by second train

$speed\times time$ =

$(26+x)2.8=x\times4.67$

$26\times2.8+x\times2.8=4.67x\\72.8+2.8x=4.67x\\$

Subtracting both sides by $2.8x$

$72.8=1.87x$

Dividing both sides by 1.87

$x=38.93$

Speed of second train = 38.93 miles per hour

$Distance=speed\times time$

= 38.93 $\times$ 4.67

= 181.80 miles.

Thus, the distance between these towns is 182 miles (nearest whole number).

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3 years ago

What does it mean if an event has a probability of 1/4?

Crank

Answer:

Step-by-step explanation:

a quarter

6 0

3 years ago

During the calendar year of 1971 a total of 171 deaths were caused by influenza in a city of 450,000 persons. The temporal distr

masha68 [24]

Answer and Step-by-step explanation:

The computation of annual and quarterly mortality rates per 100,000 population is shown below:-

Quarterly mortality rates are

$= \frac{Deaths}{Population\ in\ the\ city}\times Population$

For the first quarter

$= \frac{54}{450,000}\times 100,000$

= 12 death per 100,000 population

For the second quarter

$= \frac{43}{450,000}\times 100,000$

= 9.5 death per 100,000 population

For the third quarter

$= \frac{35}{450,000}\times 100,000$

= 7.7 death per 100,000 population

For the fourth quarter

$= \frac{39}{450,000}\times 100,000$

= 8.6 death per 100,000 population

Now the annual mortality is

$= \frac{Deaths}{Population\ in\ the\ city}\times Population$

$= \frac{171}{450,000}\times 100,000$

= 38 death per 100,000 population

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3 years ago