All categories

3 years ago

Which of the following are solutions to the quadratic equation? Check all that apply x^2 + 12x + 36 = 7

Mathematics

1 answer:

garik1379 [7]3 years ago

5 0

Answer:

x = -6 + $\sqrt{7}$ , x = -6 - $\sqrt{7}$

Step-by-step explanation:

(x + 6)² = 7

x + 6 = + or - $\sqrt{7}$

x = -6 + $\sqrt{7}$ , x = -6 - $\sqrt{7}$

You might be interested in

Scores from an exam are normally distributed with a mean of 85 and a standard deviation of 5. Suppose 188 students take the exam

charle [14.2K]

The mean is $\mu=85$ and standard deviation is $\sigma=5$ . Then the variable $X\sim N(85,5)$ .

Use substitution $Z=\dfrac{X-\mu}{\sigma}=\dfrac{X-85}{5}$ , then the variable $Z\sim N(0,1)$ .

The probability $Pr(X>80)$ can be calculated in the following way:

for X=80, $Z=\dfrac{80-85}{5} =-1$ and $Pr(X>80)=Pr(Z>-1)$ . From the diagram $Pr(Z>-1)=0.34+0.34+0.135+0.025=0.84$ .

Conclusion: if 188 students take the exam, then 188·0.84=157.92 (157) would receive a score above 80

4 0

4 years ago

Read 2 more answers

Which set is finite?

Tanzania [10]

Hello,

Answer A is the only finite set.

8 0

3 years ago

It costs $22 to enter an amusement park and $0.50 to ride a ride. You have $23. Write an equation that represents the number r o

bogdanovich [222]

Answer:

21.50 + 0.25r = 22.25

Step-by-step explanation:

Thats ur equationnn

8 0

2 years ago

A certain number was divided by 3 and 3 was added to the result. The final answer was 8 what was the number

nevsk [136]

Answer:

Step-by-step explanation:

x/3 + 3 = 8

x/3 + 9/3 = 8

x + 9 = 24

x = 15

5 0

3 years ago

How many defective telephones

zhenek [66]

Answer:

Option 3: 300 phones

Step-by-step explanation:

Given

Phone produces each day: 1000

Number of phones that were checked = 30

Defective phones = 9

So the probability of defective phones will be calculated by dividing the number of defective phones by total number of phones checked.

So, the probability of defective phones

= 9/30

= 0.3 or 30%

So, from 1000 phones the defective phones will be:

1000*0.3

= 300 Phones ..

5 0

3 years ago