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Andreas93 [3]
2 years ago
9

Type the integer that makes the following subtraction sentence true. ?-(-5)=7

Mathematics
2 answers:
Zinaida [17]2 years ago
8 0

Answer:

the answer is 2

Step-by-step explanation:

The negative symbols make it tricky. Just remember, 2 negatives = a positive.

so x- -5 = 7

Sense 2 negatives equals positive, that means we are adding 5, not subtracting negative 5.

so our new problem is x + 5 = 7

If we run the problem backwards now, (7-5=x) then we get 2

Hoped this helped, and let me know if you don't understand anything!

larisa [96]2 years ago
5 0

Answer:

the answer is 2

Step-by-step explanation:

2-(-5)=7

remember keep,change,flip

the new equation will be

2+5=7

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Sebastian went hiking near his house.The first trail he hiked on took him 4.5 miles away from his house. The second trail he hik
Sveta_85 [38]

Answer:

               <u>Sebastian is 3.8 miles away from his house.</u>

Step-by-step explanation:

4.5 - 2.4 + 1.7

2.1 + 1.7

= 3.8

- Sebastian is 3.8 miles away from his house.

4 0
3 years ago
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Jayla had 4 chocolate chip cookies and 3 sugar cookies. Her sister ate two of her chocolate chip cookies. What fraction of cooki
Ahat [919]
The starting fraction is 7/7
now you subtract 2 for the 2 cookies eaten
7/7 - 2/7 = 5/7
your end fraction is 5/7 
4 0
3 years ago
Write an equation in slope intercept form that passes through the point (3,9) and has a slope of -5
Anna35 [415]

Answer:

y= -5x +24

Step-by-step explanation:

<u>Slope-intercept form</u>

y= mx +c, where m is the slope and c is the y-intercept.

Given that the slope is -5, m= -5.

Substitute m= -5 into the equation:

y= -5x +c

To find the value of c, substitute a pair of coordinates that the line passes through into the equation:

When x= 3, y= 9,

9= -5(3) +c

9= -15 +c

c= 9 +15

c= 24

Thus, the equation of the line is y= -5x +24.

5 0
2 years ago
A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. The number of subjects needed to estima
Ludmilka [50]

Answer:

n=(\frac{1.64(14.7)}{3})^2 =64.57 \approx 65

So the answer for this case would be n=65 rounded up to the nearest integer

And the sample size would decrease by 160-65=95 subjects

Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size  

ME represent the margin of error

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

2) Solution to the problem

Since the new Confidence is 0.90 or 90%, the value of \alpha=0.1 and \alpha/2 =0.05, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.05,0,1)".And we see that z_{\alpha/2}=1.64

Assuming that the deviation is known we can express the margin of error is given by this formula:

ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}    (a)

And on this case we have that ME =\pm 3 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=(\frac{z_{\alpha/2} \sigma}{ME})^2   (b)

Replacing into formula (b) we got:

n=(\frac{1.64(14.7)}{3})^2 =64.57 \approx 65

So the answer for this case would be n=65 rounded up to the nearest integer

And the sample size would decrease by 160-65=95 subjects

8 0
3 years ago
Um i need help with this.
blsea [12.9K]

Answer:

None of these!

Step-by-step explanation:

x + y + z = x + y + z only over here

5 0
3 years ago
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