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Travka [436]
2 years ago
14

Chance can wash the car in 2 hours, while Sandy can wash the same car in 4 hours. How many hours would it take for them to wash

the car together?
Mathematics
1 answer:
san4es73 [151]2 years ago
6 0
<span>1 hour and 1/3rd of an hour.</span>
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In an insect colony there are 270 insects after 9 days. If there were initially 80 insects how long will it take the population
Semenov [28]

Answer:

The time it will take the population to grow to 800 insects is 17 days.

Step-by-step explanation:

The growth function of the insects is exponential.

The exponential growth function is:

y=a(1+r)^{t}

Here,

<em>y</em> = final value

<em>a</em> = initial value

<em>r</em> = growth rate

<em>t</em> = time taken

It is provided that there were 270 insects after 9 days and initially there were 80 insects.

Compute the value of <em>r</em> as follows:

y=a(1+r)^{t}\\\\270=80(1+r)^{9}\\\\3.375=(1+r)^{9}\\\\\ln(3.375)=9\cdot \ln(1+r)\\\\0.135155=\ln(1+r)\\\\1+r=1.14471\\\\r=0.145

Now, compute the time it will take the population to grow to 800 insects as follows:

800=80(1+0.145)^{t}\\\\10=(1.145)^{t}\\\\\ln(10)=t\cdot \ln(1.145)\\\\t=17.00522\\\\t\approx 17

Thus, the time it will take the population to grow to 800 insects is 17 days.

7 0
3 years ago
You can make chili powder from fresh chilis. If 1 chili makes 1 tablespoon of chili powder, how many chilis should you buy?
Tresset [83]

It depends on how much chili powder you want to make. Probably just like one or two
6 0
3 years ago
cassie tells rita she will meet her in 15 to 20 minutes. If t represents the time that cassie meets rita how can you express thi
Mila [183]

Answer:

Step-by-step explanation:

Express this time interval in set notation:

15 ≤ t ≤ 20

This says that the waiting time will be between 15 and 20 minutes.

8 0
2 years ago
Selena buys 4 peaches that weigh 1 pound in all. Each peach weigh the same amount. Peaches are on sale for $2.24 per pound. Writ
DENIUS [597]

Answer:

The required equation is

4p = 2.24

And p = 0.56  [ where p is in $]

Step-by-step explanation:

Given that Selena buys 4 peaches that weight 1 pound in all.

Peaches are on sale for $2.24 per pound.

Since the total weight of peaches is 1 pound.

So the price of 4 peaches is $2.24.

Let p be the price of 1 peaches.

Then the price of 4 peaches is $(4×p)

                                                  = $4p

According to the problem,

4p = 2.24

\Rightarrow p=\frac{2.24}{4}

⇒p=0.56      [ where p is in $]

The required equation is

4p = 2.24

And p = 0.56  [ where p is in $]

8 0
3 years ago
Not sure how I would do this any buddy can help me
Alinara [238K]
I beilive the answer to that is niether.


hope this helped!
4 0
3 years ago
Read 2 more answers
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