Answer:
x = ± 4
Step-by-step explanation:
Given
x² - 1 = 15 ( add 1 to both sides )
x² = 16 ( take the square root of both sides )
x = ± = ± 4
Sam sent an email ro 3 friends on Monday. Each of the friends then sent an email to 3 friends on Tuesday. On Wednesday, each of
2 answers:
Answer:
The answer is 3x3x3.
Step-by-step explanation:
A prime factorization consists in write down a multiplication in prime numbers. In this case we have that Sam sent an email to 3 friends on Monday, then all his friends an email to 3 friends more on Tuesday and the same happen on Wednesday. So this could be write as:
Monday: 3 emails
Tuesday: 9 emails
Wednesday: 27 emails
The question is to write the number of emails sent on Wednesday, so:
Is not enough because it has to be write in prime numbers:
Now the factorization is write in prime numbers. The answer is 3x3x3.
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