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3 years ago

Why is 2 + (−3) equal to −1?

Mathematics

2 answers:

natali 33 [55]3 years ago

7 0

Answer:

The answer is D.

Step-by-step explanation:

On a number line

:-Adding a positive number means moving to the right

-Adding a negative number means moving to the left

basically the easiest way to explain is pretend to have a point at -3 if you move it to the right 2 times your point will now be at -1.

lord [1]3 years ago

6 0

Answer:

Because it is 3 units to the left of 2 on a horizontal number line. (first answer)

Step-by-step explanation:

when you substract you take the number your substracting and move it to the left of the number line the number your substracting.

In this case you have 2 and you substract 3 so from 2 you move 3 spaces from the numberline to the left

Which is the first one.

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What is the gcf of 5 (4x-3) +x (4x-3)? Explain

TiliK225 [7]

I more or less have an understanding, but,

Factor out the GCF of 4x-3 from 5(4x-3)+x(4x-3)

Making it,

(4x-3)(5+x)

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3 years ago

Drawing a card- four cards are drawn from a desk without replacement.Find these probabilities.

svetlana [45]

The deck consists of 4 jacks, 26 black cards, and 13 hearts.

There is only 1 way of drawing all 4 jacks: $\dbinom44=\dfrac{4!}{4!(4-4)!}=1$ .

There are $\dbinom{26}4=14,950$ ways of drawing 4 black cards.

There are $\dbinom{13}4=715$ ways of drawing 4 hearts.

There are $\dbinom{52}4=270,725$ ways of drawing any 4 cards.

The probabilities are then

$\dfrac{\binom44}{\binom{52}4}=\dfrac1{207,725}\approx0.00000369$

$\dfrac{\binom{26}4}{\binom{52}4}=\dfrac{46}{833}\approx0.0552$

$\dfrac{\binom{13}4}{\binom{52}4}=\dfrac{11}{4165}\approx0.00264$

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3 years ago

Chris has 2 pairs of black socks, 4 pairs of red socks, and 18 pairs of white socks in a dresser drawer. What is the probability

defon

Answer:

75%

Step-by-step explanat

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3 years ago

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Simplify. (√5+4) (√5 - 2)

son4ous [18]

Answer:

2√5 - 3

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Algebra I

Terms/Coefficients
Expand by FOIL

Step-by-step explanation:

Step 1: Define

Identify

(√5 + 4)(√5 - 2)

Step 2: Simplify

Expand [FOIL]: (√5)² - 2√5 + 4√5 - 8
Combine like terms: (√5)² + 2√5 - 8
Evaluate exponents: 5 + 2√5 - 8
Combine like terms: 2√5 - 3

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