Mathematics: 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.

Andre and Elena knew that after 28 days they

kari9249

08.02.2022

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

$2^28 \neq 28*28$

Hence, both of them are incorrect and I agree with none of them

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destiniout04231

09.04.2021

Yes, 30.00

Step-by-step explanation:

because 20% off of 149.99 is 30$ so, 150-30=120

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