What is f(-4) if f(x)=|7x-3|

Answer with explanation:

It is given that two chords  AB and CD intersect at point E.

 Also, A E= 10, E B=4 , CE=8

So, By Intersecting chord Theorem

⇒A E × E B = CE × E D

⇒10 × 4= 8 × ED

⇒ 40 =8× DE

Dividing both sides by , 8 we get

DE= 5 unit

Option: B, DE=5 unit

The correct option is [tex]\boxed{\bf option A}[/tex] i.e, [tex]\boxed{\bf 129\text{ cm}}[/tex].

Further explanation:

A circle is the set of all points on a plane whose distance from a fixed point is constant.

There are infinite points on the circle and distance of these points from the center of circle is always constant.

The distance from the center of the circle to any point on the circle is called as radius of the circle.

The circumference is the length of the circle and the formula of the circumference [tex]C[/tex] for the circle is as follows:

[tex]\boxed{C=2\pi r}[/tex]  …… (1)

Here, [tex]r[/tex] is the radius of the circle and the value of [tex]\pi[/tex] is approximately equal to [tex]3.14[/tex].

The formula of the circumference for circle is terms of diameter is as follows:

[tex]\boxed{C=d\pi}[/tex]

Here, [tex]d[/tex] is the diameter of the circle.

The relationship between diameter and the radius is as follows:

[tex]\boxed{d=2r}[/tex].

From attached Figure 1 it is observed that the radius of the circle is [tex]20.5\text{ cm}[/tex].

Substitute [tex]r=20.5[/tex] in the equation (1) to obtain the value of circumference [tex]C[/tex] as follows:

[tex]\begin{aligned}C&=2\pi r\\&=2\cdot 3.14 \cdot 20.5\\&=128.74\\ &\approx129\end{aligned}[/tex]

Therefore, the circumference of the circle is [tex]\boxed{\bf 129\text{\bf cm}}[/tex].

Thus, the correct option is [tex]\boxed{\bf option A}[/tex].

Learn more:

1. Learn more about circle https://brainly.com/question/1952668

2. Learn more about radius of circle https://brainly.com/question/1506955

Answer details:

Grade: Middle school

Subject: Mathematics

Chapter: Circle

Keywords:  Circle, radius of a circle, point, distance, diameter, circumference, d=2r, C=2pir, 129. centimeter, locus of circle, approximate, value, shown below.

The number of possible outcomes for the two remaining games is 9.

The number of possible outcomes for the two remaining games can be found by multiplying the number of outcomes for each game. Since each game can have three possible outcomes (win, lose, or tie), there are a total of 3 outcomes for each game. Therefore, the number of possible outcomes for the two games is 3 x 3 = 9.

Answer:

it takes 30 hours for Jamie to equal Lisa's earnings

Step-by-step explanation:

Lisa earns $8.10 an hour and worked 40 hours.

Total amount Lisa earns = rate times hours

Total amount Lisa earns =[tex]8.10 \cdot 40=324[/tex]

Jamie earns $10.80 an hour

LEt 'n' be the number of hours Jamie works

Total amount Jamie earns =[tex]10.80 \cdot n=10.80n[/tex]

we need to find out 'n' when Jamie earnings is equal to Lisa earnings

[tex]10.80n= 324[/tex]

Divide by 10.80 on both sides

n= 30

So it takes 30 hours for Jamie to equal Lisa's earnings

The length of the diagonal is:

                          20.3147

We know that if we draw a diagonal in a rectangle such that the length and width of a rectangle are a and b then the length of the diagonal act as a hypotenuse of a  right angled triangle with two sides of triangle as a and b.

Hence, we will use the Pythagorean Theorem to find the length of the hypotenuse (c) as follows:

[tex]c^2=a^2+b^2[/tex]

[tex]c^2=(15)^2+(13.7)^2\\\\c^2=225+187.69\\\\c^2=412.69\\\\c=\pm \sqrt{412.69}\\\\c=\pm 20.3147[/tex]

Since, length can't be negative.

Hence, we have:

[tex]c=20.3147[/tex]

Final answer:

Using the Pythagorean theorem, the length of the diagonal for a rectangular garden measuring 15 m by 13.7 m is approximately 20.31 meters.

Explanation:

The student is asking about finding the length of the diagonal of a rectangle. The rectangle has dimensions of 15 m (length) and 13.7 m (width). To find the diagonal, we can use the Pythagorean theorem, which is applicable in a right-angled triangle and states that in a right triangle, the square of the length of the hypotenuse (c) is equal to the sum of the squares of the lengths of the other two sides (a and b). The diagonal of the rectangle can be considered as the hypotenuse (c) of a right-angled triangle with the other two sides being the lengths and the width of the rectangle.

Using the dimensions of the garden:

Length (a) = 15 m

Width (b) = 13.7 m

Diagonal (c) = ?

Applying the Pythagorean theorem:

c^2 = a^2 + b^2

c^2 = 15^2 + 13.7^2

c^2 = 225 + 187.69

c^2 = 412.69

c = [tex]\sqrt{412.69}[/tex]

c ≈ 20.31 m

So, the length of the diagonal from one corner of the garden to the other is approximately 20.31 meters.

Answer:

Options A and Option E.

Step-by-step explanation:

A line has a slope of -4/5. Now a line perpendicular to this line will have the slope as [tex]m_{1}.m_{2}=-1[/tex]

Therefore [tex]m_{2}=-\frac{1}{m_{1}}=\frac{1}{\frac{4}{5} }=\frac{5}{4}[/tex]

Now we will find the slope with the help of points given in the options if they lie on the perpendicular line.

A). [tex]m=\frac{5-0}{2+2}=\frac{5}{4}[/tex]

B). [tex]m=\frac{-5-5}{4+4}=\frac{-10}{8}=-\frac{5}{4}[/tex]

C). [tex]m=\frac{0-4}{2+3}=-\frac{4}{5}[/tex]

D). [tex]m=\frac{-5+1}{6-1}=\frac{-4}{5}=-\frac{4}{5}[/tex]

E). [tex]m=\frac{9+1}{10-2}=\frac{10}{8}=\frac{5}{4}[/tex]

Options A and E are the correct options.

a. [tex]\( P(X = 66) \approx 0.014 \)[/tex]

b. [tex]\( P(X = 77) \approx 0 \)[/tex]

c. [tex]\( P(X \geq 66) \approx 0.015 \)[/tex]

d. Option C: Yes, 66 is significantly high; probability [tex]\( < 0.05 \).[/tex]

To solve this problem, we'll use the binomial probability formula:

[tex]\[ P(X = k) = \binom{n}{k} \cdot p^k \cdot (1 - p)^{n - k} \][/tex]

Where:

[tex]- \( n \) is the number of trials (77 adults in this case)\\- \( k \) is the number of successes (the number of adults believing in reincarnation)\\- \( p \) is the probability of success (the proportion of adults believing in reincarnation, which is 0.40 in this case)\\- \( \binom{n}{k} \) is the binomial coefficient, which represents the number of ways to choose \( k \) successes out of \( n \) trials.[/tex]

Now let's calculate the probabilities:

a. Probability that exactly 66 of the selected adults believe in reincarnation:

[tex]\[ P(X = 66) = \binom{77}{66} \cdot (0.40)^{66} \cdot (1 - 0.40)^{77 - 66} \][/tex]

b. Probability that all of the selected adults believe in reincarnation:

[tex]\[ P(X = 77) = \binom{77}{77} \cdot (0.40)^{77} \cdot (1 - 0.40)^{77 - 77} \][/tex]

c. Probability that at least 66 of the selected adults believe in reincarnation:

This is the sum of probabilities from 66 to 77.

[tex]\[ P(X \geq 66) = \sum_{k=66}^{77} \binom{77}{k} \cdot (0.40)^{k} \cdot (1 - 0.40)^{77 - k} \][/tex]

Let's calculate these probabilities.

a. Probability that exactly 66 of the selected adults believe in reincarnation:

[tex]\[ P(X = 66) = \binom{77}{66} \cdot (0.40)^{66} \cdot (0.60)^{11} \]\[ = \frac{77!}{66!(77-66)!} \cdot (0.40)^{66} \cdot (0.60)^{11} \]\[ \approx 0.014 \][/tex]

b. Probability that all of the selected adults believe in reincarnation:

[tex]\[ P(X = 77) = \binom{77}{77} \cdot (0.40)^{77} \cdot (0.60)^{0} \]\[ = (0.40)^{77} \]\[ \approx 0 \][/tex]

c. Probability that at least 66 of the selected adults believe in reincarnation:

[tex]\[ P(X \geq 66) = \sum_{k=66}^{77} \binom{77}{k} \cdot (0.40)^{k} \cdot (0.60)^{77 - k} \]\[ \approx 0.015 \][/tex]

So, for the options:

d. If 77 adults are randomly​ selected, is 66 a significantly high number who believe in​ reincarnation?

C. Yes, because the probability that 66 or more of the selected adults believe in reincarnation is less than 0.05.

Final answer:

The graph of g(x)=⌊x⌋-3 is the same as the graph of f(x)=⌊x⌋ but shifted downward by 3 units because of the subtraction of 3, resulting in each step being 3 units lower.

Explanation:

The student has asked how the graph of g(x)=⌊x⌋-3 differs from the graph of f(x)=⌊x⌋. The function ⌊x⌋ represents the greatest integer function or floor function, which maps a real number to the largest integer less than or equal to it. The graph of f(x) is a step function that jumps up by 1 at each integer value of x. The graph of g(x) will be exactly the same as f(x) but will be shifted downward by 3 units due to the -3 in the function. This means that each step on the graph of g(x) will occur at an integer value of y that is 3 less than the corresponding step on the graph of f(x). For example, where f(x) has a step at y=0, g(x) will have a step at y=-3.

Answer:

[tex]x= +-\frac{7}{4}[/tex]

Step-by-step explanation:

[tex]16x^2= 49[/tex]

Solve the equation for x

To solve the equation , we need to isolate x

To get x alone , we need to remove the numbers attached with x

To remove 16 we divide both sides by 16

[tex]x^2 = \frac{49}{16}[/tex]

Now to remove square from x we take square root on both sides

[tex]\sqrt{x^2} = \sqrt{\frac{49}{16}}[/tex]

square root (49) = 7

square root (16)= 4

So , [tex]x= +-\frac{7}{4}[/tex]

When we take square root we include +-

use the slope intercept equation to find the slope and the y intercept

y = mx-b

m = slope

b = y intercept

m is the number before the x so -3 is the slope

 and -1 is the y intercept

 so a point on the graph would be the y intercept at (0,-1)

Final answer:

The equation of the line that is parallel to 2x+3y=3 and passes through the point (3, −4) is y = −(2/3)x − 2. We found this by first converting the given line into slope-intercept form to find the slope, and then using the point-slope form with the given point.

Explanation:

To find the equation of the line that is parallel to 2x+3y=3 and passes through the point (3, −4), we first need to determine the slope of the given line. The equation of a line in slope-intercept form is y = mx + b, where m represents the slope. We can rewrite the given equation in slope-intercept form by isolating y:

2x + 3y = 3

3y = −2x + 3

y = −(2/3)x + 1

This shows that the slope (m) of the given line is −(2/3). Since parallel lines have the same slope, the slope of the new line will also be −(2/3). Now we use the point-slope form of a line which is y − y1 = m(x − x1), where (x1,y1) is a point on the line. Plugging in the given point (3, −4) and the slope −(2/3), we get:

y − (−4) = −(2/3)(x − 3)

Distributing the slope on the right side and moving −4 to the other side gives us the final equation:

y = −(2/3)x + 2 + −4

y = −(2/3)x − 2

This is the equation of the line that is parallel to 2x+3y=3 and passes through the point (3, −4).

Answer:

6 movies

Step-by-step explanation:

You pay each month for satellite TV = $30

and for every movie you purchase = $2.50

Let the number of the movies you purchase be x

The equation will be

30 + 2.50x = 45

2.50x = 45 - 30

2.50x = 15

x = [tex]\frac{15}{2.5}[/tex]

x = 6

You purchased 6 movies during the month.