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sladkih [1.3K]
3 years ago
7

If, on their own, it takes 6 hours for Person A to complete a task and 9 hours for Person B to complete the same task, then how

many hours would it take if they worked together? Estimate your answer to 4 places after the decimal, if necessary.
Mathematics
1 answer:
Kisachek [45]3 years ago
6 0

Answer:

Step-by-step explanation:

A does 1/6 of the task per hour.

B does 1/9 of the task per hour.

Together, they do 1/6+1/9 = 5/18 of the task per hour, finishing in 18/5 hours.

18/5 = 3.6 hours

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A building 84 ft high casts a 46 ft shadow. How tall is a building that casts a 110 ft shadow at the same time of the day? (to t
wariber [46]
The building is approximately 200.9 ft tall.
6 0
4 years ago
⦁ The population of the Tallahassee metropolitan area was 382,627 at the end of 2017 with a growth rate of 2.78%. Using the expo
a_sh-v [17]

Answer:

The exponential growth model for the population of the Tallahassee metropolitan area is y=382627(1.0278)^t.

Step-by-step explanation:

The exponential formula is

y=b(1+r)^t

Where b is initial population, r is growth rate, (1+r) is growth factor and t is time (in years) after the initial year.

The population of the Tallahassee metropolitan area was 382,627 at the end of 2017. The growth rate is 2.78%.

Here the initial year is 2017 and rate is 0.0278

y=382627(1+0.0278)^t

y=382627(1.0278)^t

Graph of the equation is shown below. The x-axis represents the number of years after 2017 and y-axis represents the total population.

Difference between 2025 and 2017 is 8 years. Put t=8

y=382627(1.0278)^8

y=382627(1.0278)^8

y=476479.828188\approx 476479

Therefore the projected population in 2025 is 476479.

7 0
4 years ago
Use division to find the unit rate. <br><br> It rained 16 inches in 8 hours.
elena55 [62]

Answer:

2 inches per hour

Step-by-step explanation:

To convert to unit rate you can turn these 2 numbers into a fraction,

( the top part of the fraction is the inches unit and the bottom part is the hours)

16 and 8 into 16/8 then you simplify the fraction. So 16/8=2.

2 also equals 2/1 so its 2 inches every 1 hour.

5 0
3 years ago
Can someone please help me asap?? I’ll mark brainlist !!
nexus9112 [7]

Answer:

It's the same price.

Step-by-step explanation:

20% of $200 is $40. Either way, you get $40 off.

7 0
3 years ago
Evaluate the following expression when x = 8<br><br> 3(x) + 7
Vikki [24]

Answer: 31

Step-by-step explanation: if x = 8 it would look like this

3(8) + 7

\/      \/

24 + 7

   \/

  31

7 0
3 years ago
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