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zysi [14]
3 years ago
15

Emily's vacuum cleaner has a power rating of 200 watts. If the vacuum cleaner does 360000 joules of work, how long did Emily spe

nd vacuuming?
Mathematics
1 answer:
MakcuM [25]3 years ago
5 0
To answer this, we need to know the formula of the relationship between the work and the power rating and time.

The formula is:
E(J)<span> = </span>P(W) ×<span> t</span><span>(s)
</span>360000 = 200 * t
t = 360000 / 200
t = 1800 s

So, Emily will spend 1800 seconds in vacuuming. It is also equivalent to 30 minutes.
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the concentration of a drug in a patient's bloodstream t hours after the drug was administrated presented by the equation c(t) =
Andrews [41]

The graph of the function has no asymptotes.

<h3>The table of values of c(t)</h3>

The function is given as:

c(t) = 5t - t² + 1

When t = 1, 2, 5, 10;

We have:

c(1) = 5(1) - 1² + 1 = 5

c(2) = 5(2) - 2² + 1 = 7

c(5) = 5(5) - 5² + 1 = 1

c(10) = 5(10) - 10² + 1 = -49

So, the table of values is

t        c(t)

1         5

2        7

5        1

10      -49

See attachment for the graph of the function

<u>The domain</u>

From the question, we understand that t represents time.

  • Time cannot be negative i.e. t ≥ 0
  • The time does not exceed 5.2 i.e. t ≤ 5.2

So, the domain is 0 ≤ t ≤ 5.2

<u>The range</u>

From the graph, the maximum of the graph is 7.25

So, the range is 0 ≤ f(t) ≤ 7.25

<u>Asymptotes</u>

From the graph, we can see that the graph has no asymptotes.

Read more about domain and range at:

brainly.com/question/10197594

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4 0
2 years ago
9log9(4) = <br><br> A. 3 <br> B. 4<br> C. 9 <br> D. 81
KATRIN_1 [288]
"<span>9log9(4) = " What do you mean by this?</span>
5 0
4 years ago
shen has ridden 4 miles of a bike course. the course is 40 miles long. what percentage of the course has shen ridden so far?
s344n2d4d5 [400]

Answer:

10% out of 100%.

Or 4/40=1/10 which is 10%.

Shen has ridden her bike for 10% of the course

4 0
4 years ago
Rewrite the following without an exponent. 6^-2<br> Please answer ASAP!
julia-pushkina [17]

Answer:

Rewriting 6^{-2} without an exponent we get \mathbf{\frac{1}{36}}

Step-by-step explanation:

We need to rewrite the following without an exponent. 6^{-2}

We need to solve the exponent to find the result.

We know the exponent rule: a^{-b}=\frac{1}{a^b}

Now using this rule to solve the equation:

6^{-2}\\=\frac{1}{6^2}\\We \:know \:that\:6^2 = 6\times 6=36\\=\frac{1}{36}

So, Rewriting 6^{-2} without an exponent we get \mathbf{\frac{1}{36}}

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3 years ago
What’s 6.5 inches times 4?
wolverine [178]

Answer:

your answer is 26 inches

8 0
3 years ago
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