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joja [24]
3 years ago
15

Solve x2 + 6x = 7 by completing the square. Which is the solution set of the equation?

Mathematics
1 answer:
blsea [12.9K]3 years ago
4 0
Use the formula b over 2 squared In order to create a new term, solve for x by using this term to complete the square. X= 1, -7
You might be interested in
8
MakcuM [25]

Answer:  C) 4.20

Explanation:

Multiply each value with its corresponding frequency:

  • 1*450 = 450
  • 10*35 = 350
  • 50*10 = 500
  • 100*4 = 400
  • 400*1 = 400

Add up the products

450+350+500+400+400 = 2100

Then divide this over the total frequency (450+35+10+4+1 = 500)

So we get 2100/500 = 4.20 as the expected value.

4 0
2 years ago
34 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 25.9 pounds and a
Vlad1618 [11]

Answer:

24.6 < μ < 27.2

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.025 = 0.975, so z = 1.96

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 1.96\frac{3.8}{\sqrt{34}} = 1.3

The lower end of the interval is the sample mean subtracted by M. So it is 25.9 - 1.3 = 24.6 pounds.

The upper end of the interval is the sample mean added to M. So it is 25.9 + 1.3 = 27.2 pounds.

So the correct answer is:

24.6 < μ < 27.2

4 0
2 years ago
Car travels 100 m in 5 seconds. What is the speed the car?
weqwewe [10]
How you do this is using the formula speed = distance/time. So this is 100/5 which is 20 meters a second. Using the conversion factor (can google "20 meters per second is how many mile") 20 meters a second = 44.7 miles per hour.

In conclusion, the answer you're looking for is D. 44.7 miles per hour.
4 0
3 years ago
Read 2 more answers
Multiply 3/5 and 3/4
ella [17]

Answer:

6/9

Step-by-step explanation:

5 0
3 years ago
Select the number that is a multiple of two a 31 b 57 c 85 d 98
Lynna [10]

Answer:

98

Step-by-step explanation:

option d..............

6 0
2 years ago
Read 2 more answers
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