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Jlenok [28]
3 years ago
5

Plz help with the math worth 21 points

Mathematics
1 answer:
irinina [24]3 years ago
7 0

Answer:

As there is one math problem over there.

Lets see the question first:

It says that "A hair dryer is rated 1200\ W,if you use the dryer for 0.25\ h.How much electric energy do you use ?"

Final answer = Electic energy =0.3\ kW\ h

Step-by-step explanation:

Electrical Energy E=Power \times time.

The total amount of electrical energy used depends on the total power used by the electrical device and the total time they are used for.

So we have been given the power of the hair dryer =1200\ W =\frac{1200}{1000}=1.2\ kW

Now the time it has been use for =0.25\ hrs

To calculate electric energy we will multiply both the terms.

Electric energy =0.12 \times 0.25 =0.3\ kW\ h

So electric energy used for the hairdryer is =0.3\ kW\ h

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X/h + 1 = -2
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Answer:

x = - 3h

Step-by-step explanation:

Given

\frac{x}{h} + 1 = - 2 ( subtract 1 from both sides )

\frac{x}{h} = - 3 ( multiply both sides by h )

x = - 3h

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3 years ago
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\dfrac{14+a}{13}=12
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X is less than or equal to 9 and greater than or equal to 5
topjm [15]
5≤x≤9 it can also be reversed as 9≥x≥5 which is the same thing
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The length of a rectangle is 4 less than three times it’s width. The perimeter is 72 feet. Find the dimensions of a rectangle
ratelena [41]

Answer:

Step-by-step explanation:

so let’s say x is the length.  Then the width will be 3x-4.  You add them together and multiply by two.  The perimeter is 72 so the equation equala 72.

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(x+3x-4)*2=72

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6 0
3 years ago
in the lab, Tammy has two solutions thta contain alcohol and is mixing them with each other. She use twice as much Solution A as
Dmitry_Shevchenko [17]

Answer:

She uses 200 milliliters of solution B

Step-by-step explanation:

Notice that there are two unknowns in this problem: 1) the amount of solution A that is being used, and 2) the amount of solution B being used. We can name such unknowns with letters to facilitate our work:

Amount of solution A to be used = A

Amount of solution B to be used = B

So, since we need to find two unknowns, we need to create a system of two equations to solve them.

Our first equation can be obtained from the sentence: "She uses twice as much Solution A as Solution B," which written in mathematical form is:

A = 2 B

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0.19 A + 0.14 B = 104

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0.52 B = 104

B = 104 / 0.52

B = 200 milliliters

4 0
3 years ago
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