All categories

2 years ago

Which equation shows the quadratic formula used correctly to solve 7x^2=9+x for x?

2 answers:

8 0

The quadratic formula that can be used to correctly solve 7x^2 = 9 + x for 'x' is:
$x = \frac{1 + \sqrt{253}}{14}$
OR
x ≈ 1.20756955, -1.06471240

WITCHER [35]2 years ago

6 0

Hello! Thank you for your question! I would be happy to help!

So here is what you would get if you use the quadratic formula:

x = 1 +- √253 / 14

x ≈ 1.20756955, -1.06471240

You might be interested in

What is the value of x in the equation 5(4x-10)+10x = 4(2x-3)+2(x-4)? A)-7/4 B)-1/4 C)3/20 D)3/2

Basile [38]

Answer:

D (3/2

Step-by-step explanation:

Simplify both side of the equation: 5(4x - 10) + 10x = 4(2x - 3) + 2(x - 4)

(5)(4x) + (5)(−10) + 10x = (4)(2x) + (4)(−3) + (2)(x) + (2)(−4)

Then you distribute: 20x + −50 + 10x = 8x + −12 + 2x + −8

(20x + 10x) + (−50) = (8x + 2x) + (−12 + −8)

Combine like terms: 30x + −50 = 10x + −20

30x - 50 = 10x - 20

Subtract 10x from both sides: 30x − 50 − 10x = 10x − 20 − 10x

20x - 50 = -20

Add 50 to both sides: 20x - 50 + 50 = -20 + 50

20x = 30

Divide both sides by 20: 20x / 20 = 30 / 20

x = 3/2

Boom! I hope that helped :)

5 0

2 years ago

Help appreciated. How many hours of training would you need to have a salary of $2,000?

Angelina_Jolie [31]

Answer: you will have 56

Step-by-step explanation:

4 0

2 years ago

Read 2 more answers

The line of best fit for a scatter plot is shown:

alex41 [277]

In the slope intercept form, b represents the y intercept.
y = mx +- b

Therefore, if the y intercept is at 6, the formula of the line will look like
y=mx + 6

This eliminates the first two options,
$y = -6x + \frac{3}{4} 
$
and
$y=6x + \frac{3}{4}$

and leaves behind
$y= - \frac{3}{4} +6$
and
$y= \frac{3}{4} x+6$

Since the line you indicated is sloping downwards towards the lower right hand corner. It must have a negative slope.

Therefore, the answer must be the 3rd option.

 $y= - \frac{3}{4} +6$

8 0

2 years ago

Now we are testing to see whether taking a vitamin supplement each day has significant health benefits. There are no (known) har

ZanzabumX [31]

Answer:

Concluding that people should take vitamin supplement each day when they don't help.

Step-by-step explanation:

We are given the following in the question:

Hypothesis:

Taking a vitamin supplement each day has significant health benefits and does not have any harmful side effects.

Null hypothesis:

Taking a vitamin supplement each day does not have have significant health benefits.

Alternate hypothesis:

Taking a vitamin supplement each day have have significant health benefits.

Type I error:

It the error of rejecting the a true null hypothesis.

So error I for this situation would be concluding that people should take vitamin supplement each day when they don't help.

3 0

2 years ago

Carol has eight and 4 3/4 yard of material do you need to use 1/3 material to make a dress how many yards of material will she n

IgorLugansk [536]

Answer:

2 11/12

Step-by-step explanation:

(1/3)×(35/4=35/12=2 11/12 yards

3 0

2 years ago