Answer each part below using only mental math, and describe your method. a. If 39 is 1% of a number, what is that number? How di
1 answer:
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The answer is .
Solution:
Use algebraic identity:
For example:
Given expression and
.
To multiply these equations.
Combine like terms together.
Hence the answer is .
Answer:
c.
Step-by-step explanation:
2x² - 4x - 3 = 0