All categories

3 years ago

Will mark as brainliest

Mathematics

1 answer:

lapo4ka [179]3 years ago

8 0

Answer:

-1 + 2 = 1

1 + (-2) = -1

-1 - 2 = -3

1 - (-2) = 3

Step-by-step explanation

When you subtract use keep change change

Rule 1 when you add : If the signs are the same add the numbers and take the sign of the bigger number.

Rule 2 when you add : If the signs are different subtract the numbers and take the sign of the bigger number.

I wanted to help you understand and i hope i did that!

You might be interested in

Of 80 people attending a dance 28 dance with their hands touching the floor. If four people at the dance are selected at random,

tensa zangetsu [6.8K]

Answer: The probability is 0.013

Step-by-step explanation:

Out of 80 people, 28 of them dance with the hands touching the ground.

Then, the probability of selecting at random someone that dances with the hands touching the floor is equal to the number of persons that dance in that way, divided by the total number of persons.

For the first selection, this is p1 = 28/80

now, the probability in the second selection will be 27/79, because we have selected 1 out of the 28 (and also 1 out of the 80)

for the third and the fourth we have:

p3 = 26/78

p4 = 25/77

Then the probability of the fourth events is equal to the product of the four probabilities:

P = (28/80)*(27/79)/(26/78)/(25/77) = 0.013

3 0

3 years ago

Read 2 more answers

1/x + 1/a=1/b,then x=

motikmotik

$\dfrac{1}{x}+\dfrac{1}{a}=\dfrac{1}{b}\ \ \ |subtract\ \dfrac{1}{a}\ from\ both\ sides\\\\\dfrac{1}{x}=\dfrac{1}{b}-\dfrac{1}{a}\\\\\dfrac{1}{x}=\dfrac{a}{ab}-\dfrac{b}{ab}\\\\\dfrac{1}{x}=\dfrac{a-b}{ab}\Rightarrow\dfrac{x}{1}=\dfrac{ab}{a-b}\to\boxed{x=\dfrac{ab}{a-b}}$

4 0

3 years ago

A company reduced the prices of its goals by 13% during a promotional sale. A product was sold for 435.00 during the promotional

tekilochka [14]

The price of the product before promotional sales was 500,000.

<h3>How to find out what the previous price was?</h3>

To find what the previous price of the product was, we must take into account that we know that 87% of the value is equal to 435,000. So to find out how much the 13% (discount) that the product had is equivalent to, we do the following operation:

435,000 × 100 ÷ 87 = 500,000

So we know that the 13% discount was 65,000

Learn more about discounts in: brainly.com/question/3541148

#SPJ1

7 0

2 years ago

Find the slope of the line that passes trough (66,68) and (21,-4)

Georgia [21]

Answer:

8/5

Step-by-step explanation:

m=(y2-y1)/(x2-x1)

m=(-4-68)/(21-66)

m=-72/-45

simplify

m=8/5

7 0

3 years ago

Select the correct answer. Two art museums are hosting new long-term exhibits. The number of daily visitors attending each exhib

bagirrra123 [75]

Answer:

Step-by-step explanation:

6 0

4 years ago