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3 years ago

What is the sum of 9 and -9? A. -18 B.18 C.0

Mathematics

2 answers:

antoniya [11.8K]3 years ago

7 0

Answer:

Step-by-step explanation:

9 and -9 added together is just 9 subtract 9 so its 0

VladimirAG [237]3 years ago

4 0

Answer: C. 0

Step-by-step explanation: 9+(-9) is the same thing as 9 - 9 which equals 0.

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3 years ago

At 12:00 noon two Mississippi steamboats are 126 miles apart. At 6:00 p.m. they pass each other going in opposite directions. If

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4 years ago

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3 years ago

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X + (3x - 4) = 5 - (-7 - 3x)

antiseptic1488 [7]

Answer:

x = 16

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Distributive Property

Equality Properties

Multiplication Property of Equality
Division Property of Equality
Addition Property of Equality
Subtraction Property of Equality

Algebra I

Terms/Coefficients

Step-by-step explanation:

Step 1: Define

Identify

x + (3x - 4) = 5 - (-7 - 3x)

Step 2: Solve for x

[Distributive Property] Distribute negative: x + 3x - 4 = 5 + 7 + 3x
[Addition] Combine like terms: 4x - 4 = 12 + 3x
[Subtraction Property of Equality] Subtract 3x on both sides: x - 4 = 12
[Addition Property of Equality] Add 4 on both sides: x = 16

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3 years ago