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4 years ago

So many similar questions.....

Mathematics

1 answer:

aleksley [76]4 years ago

7 0

In a function, every point is mapped to at most one other point. B is the answer.

In A, -1 maps to 2 points.
In C, 3 maps to 2 points.
In D, 2 maps to 2 points.

So they are not functions.

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A set of n = 5 pairs of x and y values has ssx = 10, ssy = 40 and sp = 10. for these data, the pearson correlation is

Juli2301 [7.4K]

r = correlation coefficient

$r = \frac{Sxy}{\sqrt{Sxx * Syy}}$

If: Sxx = 10, Syy = 40, Sxy = 10, then:

$r = \frac{10}{\sqrt{10 * 40}} \\\\ = \frac{10}{\sqrt{400}} \\\\ = \frac{10}{20} \\\\ = \frac{1}{2}$

5 0

3 years ago

Deena drive 585 miles in 9 hours Kristen drove 605 in 11 hours who drove the faster rate

Lady bird [3.3K]

Deena drove:
585 miles/9 hrs
....which means
her average rate was:
65miles/hour

whereas

Kristen drove:
605 miles/11 hrs
....meaning
her average rate was:
55 miles/hour

Therefore, Deena drove at a faster rate than Kristen

6 0

4 years ago

Read 2 more answers

Find the length of the diagonal BD in the quadrilateral ABCD shown in the coordinate plane ?

Leno4ka [110]

bearing in mind B is at (4,3) and D is at (-2,-4).

$\bf ~~~~~~~~~~~~\textit{distance between 2 points} \\\\ B(\stackrel{x_1}{4}~,~\stackrel{y_1}{3})\qquad D(\stackrel{x_2}{-2}~,~\stackrel{y_2}{-4})\qquad \qquad d = \sqrt{( x_2- x_1)^2 + ( y_2- y_1)^2} \\\\\\ BD=\sqrt{(-2-4)^2+(-4-3)^2}\implies BD=\sqrt{(-6)^2+(-7)^2} \\\\\\ BD=\sqrt{36+49}\implies BD=\sqrt{85}$

6 0

4 years ago

Read 2 more answers

F(x) = 3x + 2 What is f(5)? PLEASE HELP!!!!

abruzzese [7]

Resolving a function of any nature means determining your zeros or raizes.

The zeros of a function occur when the function is null.

Then:

f(x) = 3x - 2

To determine the root
f(x) = 0 = 3x - 2
3x = 2
x = 2/3 Final result

8 0

3 years ago

injured runners train on a special track at a rehabilitation center. The track is a square with a half circle on its left and ri

diamong [38]

Answer:

The length of the track is approximately 51.7 ft

The track has three sides of the square and the distance round a half of a complete circle

Step-by-step explanation:

The given track shape and measurements are;

The shape on the left side of the track = Square

The shape on the right side of the track = Half circle

The area of the square on the the left side of the track = 128 square feet

Therefore, from the area, A, of a square of side length, s, which is s × s, and letting the side length of the square = s, we have;

Area of the square portion of the track = s × s = s² = 128 ft²

Therefore, s = √(128 ft²) = 8·√(2) ft.

Whereby the side length of the square is bounded by the diameter of the half circle, we have;

Length of the diameter of the half circle = s = 8·√(2) ft.

The length of the perimeter of the half circle = π·D/2 = π × 8·√(2)/2 = π × 4·√(2) ≈ 17.77 ft.

The perimeter of the track, which is the length of the track is made up of the three sides of the square opposite to the half circle and the circumference of the half circle.

Therefore;

The length of the track = 3 × 8·√(2) ft + π × 4·√(2) ft. = 4·√2×(π+6) ≈ 51.7 ft

The length of the track ≈ 51.7 ft

Which gives;

The track has three sides of the square and the distance round a half of a complete circle.

5 0

3 years ago