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ololo11 [35]
3 years ago
14

I need to find the perimeter and area of the rectangle: the length is 4 in and the width is (2x - 4) in.

Mathematics
2 answers:
Ksenya-84 [330]3 years ago
3 0
Area= (length) x (width) = (4)  (2x - 4) = 8x - 16

Perimeter = (2 lengths) + (2 widths) = (8) + (4x - 8) = 4x
lawyer [7]3 years ago
3 0
A = BL
P = 2(B + L)

A = area
P = perimeter
B = width
L = length

A = 4(2x - 4)
P = 2(4 + (2x - 4))

Need some other bit of information to solve, like a relationship between area and perimeter . . but i can't solve for x, A, or P . . when i can only develop two equations with the given problem information . . so . .that's all :)

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Fire Fighters are attempting to rescue people from the 3rd floor of a building. The
Daniel [21]

Answer:

If it's where they can get to the building I think it's 15

Step-by-step explanation:

Cause 10 plus 5 and if that can reach where they are able to get in I'd assume it would be 15

I'm not a genius or anything so don't rely on my answer

7 0
2 years ago
A chemist needs 130 milliliters of a 47% solution but has only 35% and 87% solutions available. Find how many milliliters of eac
choli [55]

Answer: Amount of 35% solution required = 100 milliliters

Amount of 87% solution required  = 30 milliliters

Step-by-step explanation:

Given: Total solution required =  130 milliliters

Let x = Amount of 35% solution (in milliliters).

Then, Amount of 87% solution required = 130 - x

As per given,

Concentration = 0.35x +0.87(130-x)=0.47(130)

0.35x +113.1-0.87x=61.1\\\\\Rightarrow\ -0.87x+0.35x=61.1-113.1\\\\\Rightarrow\ -0.52 x= -52\\\\\Rightarrow\ x=\dfrac{52}{0.52}=100

Hence, Amount of 35% solution required = 100 milliliters

Amount of 87% solution required  = 130-100 milliliters =30 milliliters

3 0
2 years ago
21 +3+ (3 x 9) * 9+5
topjm [15]

Answer:

272

Step-by-step explanation:

Do you need this?

4 0
3 years ago
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If a pizza is cut into 8 pieces and 3 children each eat one piece, what fraction of the pizza is gone
liberstina [14]
The answer is 3/8 
hope it helps
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7 0
3 years ago
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4. The results of testing a new drug on 1,000 people with a certain disease found that 510 of them improved when they used the d
Shalnov [3]

Answer:

It would not be reasonable to say that  more than half of the people with this disease would  improve if they used the new drug

Step-by-step explanation:

Data provided in the question:

Sample size,  n = 1000

Number of people improved when they used the drug = 510

Thus,

Probability that Number of people improved when they used the drug

= 510 ÷ 1000

= 0.510

Now,

margin of error, E = 2\times\sqrt{\frac{p(1-p)}{n}}

= 2\times\sqrt{\frac{0.510(1-0.510)}{1000}}

= 0.032 = 3.2%

Therefore,

Portion of 0.510 is likely to lie in the 3.2% of the actual value of population

And,

The lower portion can be as small as p - E

= 0.510 - 0.032

= 0.478 i.e 47.8% of the sample

Hence,

It would not be reasonable to say that  more than half of the people with this disease would  improve if they used the new drug

4 0
3 years ago
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