1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Leto [7]
2 years ago
13

+23-(-20)=43 how is that so?Explanation included​

Mathematics
1 answer:
valina [46]2 years ago
7 0

Answer:

Well, when adding and subtracting negatives

You can change the symbol and positive or negative of the second number like

2 + (-1) is equal to 2 - 1

So

23 + 20 = 43

Therefore, 23 -(-23) = 43 because when you take away a debt you add to your balance.

You might be interested in
What is the area of this polygon?<br><br><br><br> Enter your answer in the box.<br><br><br> units²
never [62]
Area of rect. = 5 x 7 = 35
area of triangle = 1/2(2)(7) = 7

area of figure = 35 + 7 = 42
answer

42 <span>units²</span>
3 0
3 years ago
Read 2 more answers
A number line has marks A question mark, negative 2, B question mark, 0, 1, C-2, 3, D question mark, 5, E 6.
slavikrds [6]

Answer:

What number is represented by point B = -1  

Which point represents the number 2? = C

3 0
3 years ago
Read 2 more answers
In a class of 27 students, five students have 1 pet.
Digiron [165]

Answer:

yes, the student who has 8 pets.

Step-by-step explanation:

the majority of the class has between 0-4 pets leaving the student with 8 to be the "outlier"

3 0
3 years ago
Read 2 more answers
In a clinical test with 2161 subjects, 1214 showed improvement from the treatment. Find the margin of error for the 95% confiden
Vlad [161]

Answer:

The margin of error for the 95% confidence interval used to estimate the population proportion is of 0.0209.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the z-score that has a p-value of 1 - \frac{\alpha}{2}.

The margin of error is of:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

In a clinical test with 2161 subjects, 1214 showed improvement from the treatment.

This means that n = 2161, \pi = \frac{1214}{2161} = 0.5618

95% confidence level

So \alpha = 0.05, z is the value of Z that has a p-value of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

Margin of error:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

M = 1.96\sqrt{\frac{0.5618*0.4382}{2161}}

M = 0.0209

The margin of error for the 95% confidence interval used to estimate the population proportion is of 0.0209.

4 0
3 years ago
Find the slope of a line which goes through the points (2,5) and (−4,3)
natka813 [3]

Answer:

slope (m) = 0.75

Step-by-step explanation:

Slope (m) =

ΔY

ΔX

=

1

3

= 0.33333333333333

θ =

arctan( ΔY ) + 180°

ΔX

= 198.43494882292°

ΔX = -4 – 2 = -6

ΔY = 3 – 5 = -2

Distance (d) = √ΔX2 + ΔY2 = √40 = 6.3245553203368

Equation of the line:

y = 0.33333333333333x + 4.3333333333333

or

y =  

1 x

3

+  13

3

When x=0, y = 4.3333333333333

When y=0, x = -13

please mark brainliest

3 0
2 years ago
Read 2 more answers
Other questions:
  • Jeff has a balance of $2,513.77 on his credit card. He would like to pay off his card over the course of a year and a half by ma
    14·2 answers
  • The local high school is having a talent show. on monday they sale 5 children tickets and 3 adult tickets for $25 on tuesday the
    15·1 answer
  • What is the simplified form of the expression? 5c2-4c+3D-3+2c2d-3c+d-7
    6·1 answer
  • A factory has three machines, A, B, and C, for producing items. Machine A makes 60% of all the widgets, and machine B makes the
    5·1 answer
  • Referring to the figure, refer to the coordinate system shown and
    7·2 answers
  • How do I expand 1/6(18X_24)
    6·1 answer
  • Part A Anna took a taxi home from the airport. ​ ​The taxi fare was \$ 2.1$2.1 per mile, she gave the driver a tip of \$ 5$5, an
    8·1 answer
  • Consider the right triangular prism. What is the volume of the right triangular prism? O 15 ft O 30 ft? O 150 ft" O 300 ft)​
    11·1 answer
  • The area of a parcel of land can be represented by the expression 9x2 - 6x + 10. The parcel must be divided into 3 equal parts.
    10·1 answer
  • PLEASE PLEASEE ANSWER THE QUESTION IN THE PICTURE BELOW
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!