All categories

3 years ago

Help Solve by completing the square. x2 + 14x – 51 = 0

Mathematics

2 answers:

castortr0y [4]3 years ago

5 0

Answer:

x=3, x= -17

Step-by-step explanation:

Colt1911 [192]3 years ago

3 0

X2+14-51=0

That’s the answer

Helping hand

You might be interested in

What is the slope 3y = -4x+6

lesya [120]

Answer:

The slope is -4/3

Step-by-step explanation:

y = mx + b This is the slope intercept form of a line.

3y = -4x + 6 Divide everything by 3

y = -4/3 + 2

6 0

2 years ago

HELP ASAP-2x+5y=-15 5x+2y=-6 How would you solve this system using elimination?

Marianna [84]

Do the second one or the third one and then eliminate

6 0

3 years ago

Read 2 more answers

Mark purchased a Playstation on sale at a 40%

Roman55 [17]

The amount of the discount was $140.

7 0

3 years ago

Franchise Business Review stated over 50% of all food franchises earn a profit of less than $50,000 a year. In a sample of 130 c

nydimaria [60]

Answer:

We need a sample size of 564.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

$\pi = \frac{81}{130} = 0.6231$

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

Based upon a 95% confidence interval with a desired margin of error of .04, determine a sample size for restaurants that earn less than $50,000 last year.

We need a sample size of n

n is found when $M = 0.04$