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2 years ago

What is the value of b^2 - 4ac for the following equation? 2x^2 + 3x = -1

Mathematics

1 answer:

Shtirlitz [24]2 years ago

6 0

Hello :
2x²+3x+1=0
a=2 b=3 c=1
b²-4ac = (3)²-4(2)(1) = 1

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A car is traveling at 45mi/h, Write an equation that models the total distance (d) traveled after (h) hours. What is the graph o

tangare [24]

Speed 45m/s
Distance = speed × time
d = 45 × t
d= 45t
So, this is your equation for distance travelled in h time.

6 0

2 years ago

Read 2 more answers

Use the grid to answer questions 3-5 <br> pls help

cupoosta [38]

Answer:

3. (6 : -8)

4. (2 : -6)

5. (7 : -6)

Step-by-step explanation:

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1 year ago

A newsgroup is interested in constructing a 90% confidence interval for the proportion of all Americans who are in favor of a ne

Leto [7]

Answer:

The 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative is (0.6247, 0.6923).

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 z-score that has a p-value of $1 - \frac{\alpha}{2}$ .

Of the 533 randomly selected Americans surveyed, 351 were in favor of the initiative.

This means that $n = 533, \pi = \frac{351}{533} = 0.6585$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a p-value of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.6585 - 1.645\sqrt{\frac{0.6585*0.3415}{533}} = 0.6247$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.6585 + 1.645\sqrt{\frac{0.6585*0.3415}{533}} = 0.6923$

The 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative is (0.6247, 0.6923).

6 0

2 years ago

2x2 +5x+8<br> Given x 3-2, the expression<br> x+2.<br> is equivalent to

Masteriza [31]

Answer:

x=-1

Step-by-step explanation:

so 3-2 is 1 right so what humber + 2 is 1 well -1 becasue -1 + 1 is 0 and plus 2 would be 1 so its -1 (or x= -1). Hope this helped!

6 0

2 years ago

What is the best estimate for 34 times 57

daser333 [38]

It would be 1,800 because when you round 34 it becomes 30 and when you round 57 becomes 60 and 30 x 60 = 1,800. This helps me round remember "4 or less let it rest, 5 or more raise the score" hope that makes rounding easier!!

3 0

2 years ago