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3 years ago

Which table repersents a linear relasonship

Mathematics

1 answer:

Alex_Xolod [135]3 years ago

6 0

Table A
the x values are increasing , and the y values r multiples of 5

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What is the approximate area of the circle shown below

user100 [1]

Omg I need the same thing can someone help ??

7 0

3 years ago

What is the discriminate of the following quadratic equation? 4x^2 - 2x + 6 = 0

hram777 [196]

-92

Step-by-step explanation:

If a quadratic equation has the following form:

$ax^2 + bx + c =0, \;\;\;a \neq 0$

then its discriminant D is defined as

$D = b^2 - 4ac$

In our given quadratic equation, a = 4, b = -2 and c = 6, so its discriminant is

$D = (-2)^2 - 4(4)(6) = -92$

Note: The value of the discriminant D will determine the characteristics of the roots of the quadratic equation according to the following rules:

$D > 0,\;\;$ there will be 2 real roots

$D = 0,\;\;$ there will be 1 real root

$D < 0,\;\;$ there will be 2 imaginary roots

Hence our given quadratic equation will not have any real roots but only imaginary ones.

7 0

2 years ago

What is f(x) if y=-3x-1

omeli [17]

Does it give you any numbers for x??

7 0

3 years ago

54) Ashley and Nicole each improved their yards by planting daylilies and ornamental grass. They

Assoli18 [71]

Answer:

Daylilies- $11, Ornamental grass- $7

Step-by-step explanation:

For this one, you want to convert this into simultaneous equations.

If we let d be cost of one daylily and o be cost of one bunch of ornamental grass, we can write the equations as 2d+3o=43 and 6d+3o=87.

From there, we can see they share a like term (3o), so we subtract one equation from the other (since they both are preceded by a +). This gives 4d=44.

Dividing both sides by 4 isolates d, leaving d=$11.

We can substitute this value into either equation to work out o (I'm using the first one as it is easier). This makes it 2×11+3o=43, or 22+3o=43.

From there, we subtract 22 from both sides, giving 3o=21, and dividing by 3 gives a final result of o=$7.

**This content involves writing and solving simultaneous equations, which you may wish to revise. I'm always happy to help!

All working out:

d- cost of one daylily o- cost of one bunch of ornamental grass

2d+3o=43 6d+3o=87

6d+3o=87

- - -

2d+3o=43

= = =

4d =44

÷4 ÷4

d =11

2d+3o=43

2×11+3o=43

22+3o=43

3o=21

o=7

3 0

3 years ago

Suppose that the distribution is bell-shaped. If approximately 99.7% of the lifetimes lie between 568 hours and 1066 hours, then

irakobra [83]

Answer:

$\sigma =\frac{478}{6}=79.667$

Step-by-step explanation:

The empirical rule, also referred to as "the three-sigma rule or 68-95-99.7 rule, is a statistical rule which states that for a normal distribution, almost all data falls within three standard deviations (denoted by σ) of the mean (denoted by µ)". The empirical rule shows that 68% falls within the first standard deviation (µ ± σ), 95% within the first two standard deviations (µ ± 2σ), and 99.7% within the first three standard deviations (µ ± 3σ).

And on this case since we are within 3 deviations (because we have 99.7% of the data between 568 and 1066hours), the result obtained using the z score agrees with the empirical rule.

So on this case we can find the standard deviation on this ways:

$\mu -3\sigma = 568$ (1)

$\mu +3\sigma = 1066$ (2)

If we subtract conditions (2) and (1) we got:

$1066-588 =\mu +3\sigma -\mu +3\sigma$

$478= 6\sigma$

$\sigma =\frac{478}{6}=79.667$

3 0

3 years ago