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rewona [7]
3 years ago
13

QUESTION 10

Mathematics
2 answers:
VARVARA [1.3K]3 years ago
4 0

Answer:

  • See below

Step-by-step explanation:

Let the first test score is x, then the next two are x - 10 and x - 20 and the total of three is 258.

<u>We can reflect this as:</u>

  • x + x - 10 + x - 20 = 258

<u>Solving we get:</u>

  • 3x - 30 = 258
  • 3x = 258 + 30
  • 3x = 288
  • x = 288/3
  • x = 96

<u>The scores are:</u> 96, 86 and 76

alexandr402 [8]3 years ago
3 0

Answer:

let the grade points be a,b,c

a+b+c=258

b=c+10( since she noticed that on tests two and three,she scored 10 points fewer).

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IceJOKER [234]
<h3>Solution:</h3>

\frac{1}{3}  \times  \frac{21}{4}  -  \frac{11}{2}  \div  \frac{22}{5}  \\  =  \frac{1}{3}  \times  \frac{21}{4}  -  \frac{11}{2}  \times  \frac{5}{22}  \\  =  \frac{1}{3}  \times  \frac{21}{4}  -  \frac{5}{4}  \\  =  \frac{7}{4}  -  \frac{5}{4}  \\  =  \frac{2}{4}  \\  =  \frac{1}{2}

<h3>Answer:</h3>

\frac{1}{2}

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3 years ago
A geologist visits 40 volcanoes in Alaska and California. 15% of the volcanoes are in California.
kotegsom [21]

Answer:

<h2>Most explained:</h2>

40% = 100%

15 = (100% - 15% = 85%) 85% in Alaska

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<h2>The simple way (or the way i found it simple):</h2>

<h3>40 - 15 = 34</h3><h3>15% of 40 = 6</h3>

<h3>(I found the simple way after i solve the first way)</h3>

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3 0
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Blababa [14]

Answer:

3 * 10 is the correct answer to the given question .

Step-by-step explanation:

Equivalent expression are the same expressions although they can appear tiny bit differently.In the given question we have to express  10 + 10 + 10 in the multiplication form

Therefore

3\ * \ 10

i. e=30

Which is same as

10 + 10 + 10

=30

so

3 * 10 is the correct answer

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