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Arlecino [84]
3 years ago
8

Why is 9 -1is 8 can some one help me because i dont understand why is not 10

Mathematics
2 answers:
xenn [34]3 years ago
4 0
Its 8 because your not adding your subtracting.
SashulF [63]3 years ago
3 0
Ah, the dash, this thing, - means subtraction, which is the opposite of addition, and takes away numbers. Meaning 9-1 is 9, but you count down by 1 rather than up one.
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Answer:

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General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

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<u>Algebra I</u>

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Step-by-step explanation:

<u>Step 1: Define</u>

(-10x² + 9) + (8x² - 5x + 7)

<u>Step 2: Simplify</u>

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  2. Combine like terms (Z):                                                                                   -2x² - 5x + 16
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Answer:

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270+855=1,125

Step-by-step explanation:

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