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serious [3.7K]
2 years ago
11

Help me please I realy need help

Mathematics
1 answer:
velikii [3]2 years ago
3 0

Answer:

sry i cant help u and your jumping horses

Step-by-step explanation:

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What is 3d+8=2d-7 is equations
fredd [130]
3d + 8 = 2d - 7 equals d = -15.

First, 
subtract 2d from both sides. Your problem should look like: 3d + 8 - 2d = -7.
Second, simplify 3d + 8 - 2d to get d + 8. Your problem should look like: d + 8 = -7.
Third, subtract 8 from both sides. Your problem should look like: d = -7 - 8.
Fourth, simplify -7 - 8 to get -15. Your problem should look like: d = -15, which is your answer.

Hopefully this helps, I'm not exactly sure what you meant by "is equations," but this is how you solve the problem.
6 0
2 years ago
Greg is traveling north on a road while Peter is traveling south on the same road. They pass by each other at noon, Greg driving
max2010maxim [7]

40x+30x=315

70x=315

315/70= 4.5 hours

12:00 noon + 4.5 hours = 4:30 pm


5 0
2 years ago
I gotta submit this by 11:59 please help
Andrews [41]
Turning a car on and off, turning the oven on and off
5 0
2 years ago
Read 2 more answers
A randomly selected sample of n =51 men in Brazil had an average lifespan of 59 years. The standard deviation was 10 years. Calc
Aloiza [94]

Answer:

59-2.40\frac{10}{\sqrt{51}}=55.639    

59+ 2.40\frac{10}{\sqrt{51}}=62.361    

The 98% confidence interval would be given by (55.639;62.361)    

Step-by-step explanation:

Information given

\bar X= 59 represent the sample mean

s= 10 represent the sample deviation

n= 51 represent the sample size

Solution to the problem

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

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

The degrees of freedom are given by:

df=n-1=51-1=50

The Confidence is 0.98 or 98%, the significance would be \alpha=0.02 and \alpha/2 =0.01,and the critical value would be t_{\alpha/2}=2.40

And replacing we got:

59-2.40\frac{10}{\sqrt{51}}=55.639    

59+ 2.40\frac{10}{\sqrt{51}}=62.361    

The 98% confidence interval would be given by (55.639;62.361)    

3 0
3 years ago
A teacher decided to bring a jar of 530 pieces of small candy to his 100-student classroom so students could practice estimation
nordsb [41]

Answer:

Yes, because the population distribution is normally distributed, and we have a random sample.

Step-by-step explanation:

If the population is skewed, then the sample mean won't be normal for when N is small.

If the population is normal, then the distribution of sample mean looks normal even if N = 2.

If the population is skewed, then the distribution of sample mean looks more and more normal when N gets larger.

Since we have use 33% of the student, then N is large enough to conclude that the student are bad at guessing

8 0
3 years ago
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