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Ipatiy [6.2K]
2 years ago
3

Whe she was in year 8, sarah could run 800 metres in 3 minutes and 20 seconds. Three years later, when she was in year 11, she c

ould run 800 metres in 2 minutes and 44 seconds. Find the percentage improvement in her time.
Mathematics
1 answer:
vampirchik [111]2 years ago
4 0
Info u have

8yr : 3min 20s=60s * 3 + 20s = 180s + 20s = 200s
11yr : 2min 44s = 60s * 2 + 44s = 120s + 44s = 164s

Counting:

200s - 164s = 36s

36s 18
——- = ——- = 18%
200s. 100

Check:

200s * (100% - 18%) = 164s
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Answer: the correct answer is D.

Step-by-step explanation:

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2 years ago
On a coordinate plane, polygon GHIJ translates 8 units to the left to form polygon G'H'I'J'. Which of the following equations is
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A. True. This is because distances are preserved and kept the same. 

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7 0
2 years ago
Which expression is equivalent to (4 + 7i)(3 + 4i)? –16 + 37i 12 – 28i 16 – 37i 37 + 16i
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Answer:

The equivalent expression is \Rightarrow -16+37i    

A is correct

Step-by-step explanation:

 We are given two complex number and need to multiply it. To find equivalent fraction.

(4+7i)(3+4i)

Using Binomial product property: (a+b)(c+d)=ab+ad+bc+bd

\Rightarrow (4+7i)(3+4i)

\Rightarrow 4(3)+4(4i)+7i(3)+7i(4i)

\Rightarrow 12+16i+21i+28i^2

Combine the like term and simplify

\Rightarrow 12-28+37i           \because \ \ i^2=-1

\Rightarrow -16+37i    

Hence, The equivalent expression is \Rightarrow -16+37i    

4 0
2 years ago
Read 2 more answers
There are 3 identical wooden blocks that are 50 inches long, 5 inches wide and 3 inches thick. If you glue them together, what i
finlep [7]

Answer:

336 inches of surface area

Step-by-step explanation:

The explanation is the picture.  I hope this answers your question.

4 0
2 years ago
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Write an expression for the calculation double 2 and then add5
Lyrx [107]
So,

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2(2)

"add 5"
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Therefore, the whole expression would be:
2(2) + 5

If you wanted to evaluate it, it would come out like this.
4 + 5
9
5 0
2 years ago
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