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puteri [66]
3 years ago
7

Simplify this expression: 13 + (–12) – (–5) = ? A. 6 B. –6 C. –30 D. 30

Mathematics
2 answers:
Anuta_ua [19.1K]3 years ago
3 0
13 + (-12) - (-5)

13 - 12 + 5

1 + 5

= 6.

Answer is A)
Mariana [72]3 years ago
3 0
 <span>13+(-12) is the same as 13-12 which is 1 

1-(-5) 

two negatives make a positive so this really means 
1+5 which equals 6 
</span>=A.
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Please help ASAP :) this is really easy ino lol
Zanzabum

Known :

Ratio = Greg : Harry = 1 : 3

Greg's money = £8

Asked :

Harry's money = ...?

Answer :

\:  \ \:  \:  \:   \:  \:  \:  \frac{1}{3}  =  \frac{greg}{harry}  \\   \:  \:  \:  \:  \:  \:  \:  \: \frac{1}{3}  =  \frac{8}{harry}  \\ harry =  \frac{3 \times 8}{1}  \\ harry = 24

So, Harry gets £24

<em>Hope </em><em>it </em><em>helpful </em><em>and </em><em>useful </em><em>:</em><em>)</em>

5 0
3 years ago
How many number cards are there in a deck of cards
mart [117]
...aish maybe about 100-
3 0
3 years ago
Write an equation of the line that passes through (2, -3) and is perpendicular to the line y=-2x-3
Natalija [7]

Answer:

y=\frac{1}{2} (x-2)-3 or y=\frac{1}{2} x-4

Step-by-step explanation:

The perpendicular slope is the opposite-reciprocal of the original slope:

Perpendicular slope of -2 is \frac{1}{2}

Write the equation in point-slope form (y=a(x-h)+k):

y=\frac{1}{2} (x-2)-3

Convert to slope-intercept form if needed:

y=\frac{1}{2} x-1-3

y=\frac{1}{2} x-4

8 0
3 years ago
Read 2 more answers
In a study on the time that
krok68 [10]

The 95% confidence interval of the population mean, in years, is (4.3, 5.3). 4 years is not part of the confidence interval, which means that it contradicts the fact that 39% of students get their college degree in four years.

-----------------------------

To solve this question, we need to find the confidence interval for the amount of time it takes the students to get the degree.

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

-----------------------------

The first step to solve this problem is finding how many degrees of freedom,which is the sample size subtracted by 1. So

df = 80 - 1 = 79

-----------------------------

95% confidence interval

Standard level of confidence, we have to find a value of T, which is found looking at the t table, with 79 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 1.9905.

-----------------------------

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 1.9905\frac{2.2}{\sqrt{80}} = 0.5

In which s is the standard deviation of the sample and n is the size of the sample.

-----------------------------

The lower end of the interval is the sample mean subtracted by M. So it is 4.8 - 0.3 = 4.3 years.

The upper end of the interval is the sample mean added to M. So it is 4.8 + 0.3 = 5.3 years.

-----------------------------

The 95% confidence interval of the population mean, in years, is (4.3, 5.3). 4 years is not part of the confidence interval, which means that it contradicts the fact that 39% of students get their college degree in four years.

A similar question is given at brainly.com/question/24278748

6 0
3 years ago
Matthew wants to estimate the mean height of students attending his collage. He records the heigjts of 100 randomly selected stu
Strike441 [17]

Answer:

ned more info

Step-by-step explanation:

5 0
3 years ago
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