Mathematics

Mathematics, 17.09.2020 14:01, veronica022

20 is 85% of what number?

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Which expression is equivalent to (5x^7+7x^8) − (4x^4−2x^8)? a. 9x^8 + 5x^7−4x^4 b. 3x^8 + 7x^7 c. 12x^8 − 2x^4 d. 5x^8 + 5x^7 + 4x^4

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Find two numbers if their ratio is 4: 7 and their difference is 123.

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