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Marat540 [252]
3 years ago
8

Andre and Elena knew that after 28 days they would have 2²⁸ coins, but they wanted to find out how many coins that actually is.

Andre wrote: 2 28 = 56. Elena said, "No, exponents mean repeated multiplication. It should be 28 28, which works out to be 784." Do you agree with either of them? Explain your reasoning.
Mathematics
1 answer:
vlada-n [284]3 years ago
6 0

Answer:

I agree with none of them

Step-by-step explanation:

Given

Expression= 2^{28}

Andre: 2 * 28 = 56

Elena: 28 * 28 = 756

Required

Who is correct?

Expression= 2^{28}

When we apply law of indices to the above, it gives 2 multiplies by itself in 28 places

i.e.

Expression= 2^{28}

Expression= 2*2*2*..........*2 ---- in 28 places

Andre's interpretation of the expression is incorrect as:

2^{28} \neq 56

Also, Elena's expression is incorrect.

This is so, because

2^28 \neq 28*28

<em>Hence, both of them are incorrect and I agree with none of them</em>

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one number is 4 times a first number. A third number is 100 more than the first number. if the sum of the three numbers is 592 f
kati45 [8]

<u>Answer</u>

1st number = x

2nd number = 4x

3rd number = x + 100

sum of three numbers = 592

x + 4x + x + 100 = 592

6x + 100 = 592

6x = 592 - 100

6x = 492

x = 492/6

x = 82

1st number, x = 82

1st number, x = 822nd number, 4x = 328

1st number, x = 822nd number, 4x = 3283rd number, x+100 = 182

check :

82 + 328 + 182 = 592

pls mark as brainliest. . . ☺

3 0
3 years ago
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Varvara68 [4.7K]

Answer:

<h3>-10a² + 5a</h3>

Step-by-step explanation:

Given the expression (–5a)(2a – 1)

Open the bracket

(–5a)(2a – 1)

= -5a(2a) -5a(-1)

= -10a² + 5a

<em>hence the equivalent expression is -10a² + 5a</em>

8 0
3 years ago
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Hope this helped you out!

3 0
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elixir [45]

Answer:

I think the answer is 25

Step-by-step explanation:

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Multiply 5 by 10 to get 50

Divide 50 by 2 to get 25

So, you'll need 25 gallons of paint.

Hope this helped!

(Please mark as Brainliest <3)

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blondinia [14]

The probability of an event that has two possible outcomes is 1/2

<h3>What is Probability?</h3>

This refers to the likelihood of an event occurring and this can be found by calculating using a mathematical model.

It should be noted that your question is incomplete so I gave you a general overview to help you get a better understanding of the concept.

Read more about probability here:

brainly.com/question/24756209

#SPJ1

4 0
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