What is the surface area of the cube below?


A. 150 units^2

B. 75 units^2

C. 300 units^2

D. 50 units^2

Answer:

The third one

Step-by-step explanation:

Slope is rise/run

This graphs shows the line going up by 2 and to the right 3

The graph that has a slope equal to 2/3 is Option(C) .

Slope of a straight line is defined as the inclination of the line with respect to the coordinate axis. The slope is also measure of the tangent of angle with which the line is inclined to the axis.

Slope of a straight line can be found using two given points say (x1,y1) and (x2,y2).

Slope (m) = (y2 - y1) / (x2 - x1) .

We check the graph at Option(C).

The coordinate of the point where the graph has 2 units distance with the y-axis is (4.5,2) and the coordinate of the point where the graph has 3 units distance with the x-axis is (1.5,0).

We have y2 = 2 , y1 = 0, x1 = 4.5, x2 = 1.5 .

Thus slope = (y2  y2)/(x2 - x1) = (2 - 0)/(4.5 - 1.5) = 2/3

Therefore, the graph that has a slope equal to 2/3 is the graph in  Option(C) .

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Answer:

It would take Jenny 20 minutes to walk 1 mile

Step-by-step explanation:

To find how many minutes it would takes her to walk 1 mile, you have to find out the rate of her walking 2.5 miles.

So divide 2.5/50

She walked 0.05 miles per minute

there are 20 0.05 in one mile so

It would take Jenny 20 minutes to walk 1 mile

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Answer: First Option

The number of multiples of 9 is 211

Step-by-step explanation:

Note that the first multiplo of 9 between 100 and 2000 is number 108. The last multiple of 9 is 1998.

If we use the arithmetic sequence to perform the calculation

[tex]a_n = a_1 + d(n - 1)[/tex]

So the first term [tex]a_1[/tex] is:

[tex]a_1 = 108[/tex]

The last term [tex]a_n[/tex] is

[tex]a_n = 1998[/tex]

The common difference is

[tex]d = 9[/tex]

Thus

[tex]1998 = 108 + 9(n-1)[/tex]

We solve the equation for n and obtain the number of multiples of 9.

[tex]1998-108 = 9(n-1)\\\\\frac{1998-108}{9}=n-1\\\\n = 210 +1\\\\n = 211[/tex]

196.00000000000000000000000

The sequence in question is a geometric sequence, with a common ratio of 0.5. The explicit formula for the sequence is f(n) = 16 * (0.5)^(n-1).

The sequence described in the problem, where Achilles eats half of the remaining pizza slices every hour, is a geometric sequence. A geometric sequence is a sequence of numbers where each term after the first is obtained by multiplying the preceding term by a fixed, non-zero number called the common ratio.

In this case, the common ratio is 0.5 (since Achilles is eating half of the remaining pizza each time). If we let n be the hour (or term number in the sequence), the explicit formula for this sequence is: f(n) = 16 * (0.5)^(n-1)

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Answer:

FINAL ANSWER: f is a geometric sequence

EQUATION: [tex]f(n)=8*(\frac{1}{2})^{n-1}[/tex]

Step-by-step explanation:

KHAN ACADEMY

Answer:

A. It has reflectional symmetry

B. It is symmetrical

D. It has five lines of symmetry

Step-by-step explanation:

we know that

A regular pentagon has 5 sides and 5 lines of symmetry. The number of lines of symmetry in a regular polygon is equal to the number of sides

Every regular polygon has reflectional symmetry

Regular polygons are symmetrical

therefore

A. It has reflectional symmetry ------> Is true

B. It is symmetrical -----> Is true

C. It has exactly one line of symmetry ----> Is false

D. It has five lines of symmetry -----> Is true

Answer:

A. It has reflectional symmetry

B. It is symmetrical

D. It has five lines of symmetry

Step-by-step explanation:

Answer:

Critical points of an equation are the zeroes of its first derivative. Since you have already provided me with the derivative (thanks for saving me the effort :) ), I am just going to start the process.

tan (x) + x(sec^2(x)) = 0

Solving this equation (using a graphing calculator set to radians), it is only true when x = 0.

So, 0 is a critical point of this function.

Hope this helped!

The derivative of tan(x) is sec^2(x) and the critical points for xtanx occur at x = π/2 + nπ.

Derivative of tan(x) can be found by using the formula: d/dx(tan(x)) = sec^2(x). Critical points for xtanx can be obtained by setting the derivative equal to zero and solving for x. In this case, the critical points are where sec^2(x) = 0, which occurs when x = π/2 + nπ, where n is an integer.

Answer:

Step-by-step explanation:

Easiest way, pick any two even numbers in that range, they will have at least 2 as a common factor.

Answer: 0) 0.22

              1) 0.20

              2) 0.12

              3) 0.14

              4) 0.28

              5) 0.04

Step-by-step explanation:

The total frequency is 33+30+18+21+42+6 = 150.  This means they ran the experiment 150 times.  The probability (P) is calculated by the satisfactory number of outcomes (frequency) divided by the total number of experiments/outcomes (total frequency):

[tex]\begin{array}{c|c||lc}\underline{x}&\underline{f}&\underline{f\div 150}&\underline{\text{P}}\\0&33&33\div 150=&0.22\\1&30&30\div150=&0.20\\2&18&18\div 150=&0.12\\3&21&21\div 150=&0.14\\4&42&42\div 150=&0.28\\5&6&6\div 150=&0.04\end{array}\right][/tex]

Answer:

The graph c.

Step-by-step explanation:

We know from the function f(x) = 5sin(-2t) three things:

1. The amplitude is 5.

2. The period is π.

3. Because of the negative in the argumen, the graph will be reflected over the y-axis (Compared to the graph of sin(x))

Then, evaluating all the functions we find:

1. All of graphs have an amplitude of 5.

2. The graph b has a period of 2π.

3. The graph a is not reflected over the y-axis.

Then, the correct graph is the graph letter C.

The Graph of the function f(t) = 5 sin(-2t) is graph (b) in the image you provided.

This can be seen by noting that the function f(t) = 5 sin(-2t) is a sine function with a period of π, amplitude of 5, and horizontal shift of π/2 to the right. Graph (b) in the image matches these characteristics.

Amplitude: The amplitude of the function is 5, which is the absolute value of the coefficient in front of the sine term.

Period: The period of the function is π/2, which is the reciprocal of the absolute value of the coefficient multiplying the t term.

Phase shift: The function has a phase shift of π, which means that the graph is shifted to the left by π units.

The graph on the left has all of these features:

It has an amplitude of 5.

It has a period of π/2.

It is shifted to the left by π units.

The other graphs in the image do not match these characteristics:

Graph (a) has a period of 2π, not π.

Graph (c) has an amplitude of 1, not 5.

Graph (d) has a horizontal shift of −π/2, not π/2.

Therefore, the correct graph is graph (b).

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Answer:

D. This should be the correct answer as it shows similarity through AAA.

A. is not correct because one side is not enough to determine similarity.

B. is not correct because it angle Z & angle Y are not similar.

C is not correct because line ZY and YX are not similar.

Answer:

The range is 1

Step-by-step explanation:

To calculate range, you subtract the lowest value from the highest value.

The lowest is 5 here and the highest is 6. The range is 6-5 which equals 1.

Answer:

1

Step-by-step explanation:

You are finding the range, which can be found by subtracting the smallest number from the greatest number.

Smallest number = 5, Greatest number = 6

6 - 5 = 1

1 is your range answer.

~

Answer: [tex]JK=8[/tex]

Step-by-step explanation:

You can observe in the figure that JK is a tangent and KH is a secant and both intersect at the point K. Then, according to the Intersecting secant-tangent Theorem:

[tex]JK^2=KE*KH[/tex]

You know that:

[tex]KH=KE+HE[/tex]

Then KE is:

[tex]KE=KH-HE[/tex]

[tex]KE=16-12[/tex]

[tex]KE=4[/tex]

Now you can substitute the value of KE and the value of KH into  [tex]JK^2=KE*KH[/tex] and solve for JK. Then the result is:

[tex]JK^2=4*16\\JK^2=64\\JK=\sqrt{64}\\JK=8[/tex]

Both intersecting point K, JK is a tangent and KH is a secant. You can use the intersecting secant-tangent Theorem:

JK^2=KH*EK

First you can do

KH=EK+EH

KE=4

Then you can substitute.

JK^2=64

JK=8

Answer:

The diagonal of a square with 90 ft. per side is 127.28 which should be rounded down to 127 and the throw from 2nd to 3rd is 90 ft totaling 217 ft

The baseball moves 217.4 feet across the field in total.

Measured from the middle of the backstop to the apex of the home plate. Place second base in the centre by drawing a line from the backstop's centre point over the pitcher's mound, through the apex. The distance that needs to be measured is between the centre of the second base and the top of the home plate.

So we are given that each side of a square is 90 feet.

By finding how far the ball will travel, we are basically finding the distance from 2nd base to home

Well, let's picture a baseball field, and we find out that they are diagonal across from one another.

Well, let's draw a diagonal connecting home to 2nd base.

Since the field is a square, it has a right angle at 1st base

We now know 2 legs in a right triangle, which calls for the Pythagorean Theorem

(You could also do a 45-45-90 special right triangle, which would give you the answer very quickly)

So we have 90²+90²=c²

Which is

16200=c²

We are finding c

, so √16200=c

We can simplify this to √162⋅100 which is 10√162

Then we can simplify this to 10√81⋅2, that is 10⋅9√2

Finally, we multiply the values outside of the root to get = 90√2

the throw from 2nd to 3rd is 90 ft

total distance covered = 90 + 90√2

total distance covered = 217.4

Therefore, baseball travels in the field a total of 217.4 feet

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Answer:

42 min

Step-by-step explanation:

Joanna takes 2 mins to send a text.

2 mins = 2 x 60 sec = 120 sec

Anna takes 40 seconds to send a text

120 ÷ 40 = 3

Anna can text 3 messages in 120 sec

Together, in 120 sec ,

both of them can send out 1 + 3 = 4 texts

Number of 120 seconds needed to send 84 texts

= 84 ÷ 4

= 21

Number of seconds needed

= 21 x 120

= 2520

25020 sec = 2620 ÷ 60 min = 42 min

75 // common factor is 3

The upper value of the confidence interval is 0.478.

A confidence interval is a range of values that are constrained by the statistic's mean and that are likely to include an unidentified population parameter. The proportion of likelihood, or certainty, that the confidence interval would include the real population parameter when a random sample is drawn several times is referred to as the confidence level.

Given:

A random sample of 150 people from Iowa has been given cholesterol tests, and 60 of these people had levels over the "safe" count of 200. Construct a 95% confidence interval for the population proportion of people in Iowa with cholesterol levels over 200.

p' = 60/150

p' = 0.4

n = 150

95% Â → z(1-a/2) = 1.96

So the interval is:

[0.4 - 1.96{sqrt(0.4(0.6)/150)}], 0.4 + 1.96{sqrt(0.4(0.6)/150)}

= (0.322, 0.478)

Therefore, the interval is (0.322, 0.478).

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Using the confidence interval formula for a proportion, we find that the upper limit is approximately 0.468, indicating a maximum of 46.8% of the population might have cholesterol levels above 200 with 95% confidence.

First, calculate the sample proportion (p) by dividing the number of positive outcomes (60) by the total sample size (150), which gives us p = 0.4. The formula for the confidence interval of a proportion is given by p ± Z*√(p(1-p)/n), where Z is the Z-score corresponding to the confidence level (for 95%, Z = 1.96), p is the sample proportion, and n is the sample size. Plugging in the values, we calculate:

Lower limit = 0.4 - 1.96*√(0.4*0.6/150) ≈ 0.332

Upper limit = 0.4 + 1.96*√(0.4*0.6/150) ≈ 0.468

The upper value of the confidence interval is approximately 0.468, which means we are 95% confident that the true proportion of people in Iowa with cholesterol levels over 200 is less than 46.8%.

Answer:

It's the second option x = (3y - 11) / 5.

Step-by-step explanation:

3/5 = x+1/y-2

Cross multiplying:

3(y - 2) = 5(x + 1)

3y - 6 = 5x + 5

5x =  3y - 6 - 5

5x = 3y - 11

x = (3y - 11) / 5.

Answer:

A

Step-by-step explanation:

x² + 10x + 24 = 0

Here, a = 1, b = 10, c = 24.  Factoring using the AC method:

ac = 1×24 = 24

Factors of 24 that add up to 10 are +4 and +6.

Therefore:

(x + 4) (x + 6) = 0

x + 4 = 0, x + 6 = 0

x = -4, x = -6

The roots are -4 and -6.  Added together:

-4 + -6 = -10

Answer A.

The required sum of the roots of the quadratic equation x² + 10x + 24 = 0 is -10.

In mathematics, the roots of an equation are the values of the variable that satisfy the equation.

Here,
To find the roots of the quadratic equation x² + 10x + 24 = 0, we can use the quadratic formula,

x = (-b ± √(b² - 4ac)) / (2a)

In this case, a = 1, b = 10, and c = 24. Substituting these values, we get:

x = (-10 ± √(10² - 4(1)(24))) / (2(1))

x = (-10 ± √4) / 2

x = -5 ± 1

Therefore, the roots of the quadratic equation are x = -4 and x = -6.

The sum of these roots is -4 + (-6) = -10

Therefore, the sum of the roots of the quadratic equation x² + 10x + 24 = 0 is -10.

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Answer:

13.8 percent

Step-by-step explanation:

Answer:

b = 14[tex]\sqrt{2}[/tex]

Step-by-step explanation:

Since the triangle is right use the cosine ratio to find b

cos45° = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{b}{28}[/tex]

Multiply both sides by 28

28 × cos45° = b

28 × [tex]\frac{\sqrt{2} }{2}[/tex] = b ( cancel the 28 and 2 )

b = 14[tex]\sqrt{2}[/tex]

Answer:

14√2.

Step-by-step explanation:

This is a 45-45-90 triangle so the ratio of the sides is 1:1:√2.  ( By the Pythagoras theorem).

so b / 28 = 1 / √2

√2 b = 1*28

b = 28 / √2

= 28√2 / 2

= 14√2  answer.

The angle between the legs labeled [tex]x[/tex] and [tex]y[/tex] is complementary to the angle with measure 31 degrees, so that angle has measure 90 - 31 = 59 degrees. Then

[tex]\sin59^\circ=\dfrac{400}x\implies x=\dfrac{400}{\sin59^\circ}\approx466.7[/tex]

Answer:

15/20 or 3/4

Step-by-step explanation:

9 green marbles(GM) + 5 yellow marbles(YM) + 6 red marbles(RM) = 20 marbles total(TM)

GM = 9/20

YM = 5/20

RM = 6/20

TM = 20/20

For the probability of choosing a GM or RM you just add their respective values:

9/20 + 6/20 = 15/20

Simplified this answer is 3/4

Probability of selecting a green or red marble is 3/4

Given that;

Number of green marble = 9

Number of red marble = 6

Number of yellow marble = 5

Find:

Probability of selecting a green or red marble

Computation:

Probability of selecting a green = 9 / [9 + 6 + 5]

Probability of selecting a green = 9 / 20

Probability of selecting a red = 6 / [9 + 6 + 5]

Probability of selecting a green = 6 / 20

Probability of selecting a green or red marble = [9/20] + [6/20]

Probability of selecting a green or red marble = 15 / 20

Probability of selecting a green or red marble = 3/4

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Parameterize the line segment (call it [tex]C[/tex]) by

[tex]\vec r(t)=(1-t)(4,4,2)+t(5,8,-4)=(4+t,4+4t,2-6t)[/tex]

with [tex]0\le t\le1[/tex]. Then the line integral of [tex]\vec f(x,y)=y\,\vec\imath+x\,\vec\jmath+3\,\vec k[/tex] is

[tex]\displaystyle\int_C\vec f\cdot\mathrm d\vec r=\int_0^1(4+4t,4+t,3)\cdot(1,4,-6)\,\mathrm dt=\int_0^1(2+8t)\,\mathrm dt=6[/tex]

Final answer:

To evaluate the line integral of the given vector field along the line segment, parametric equations are established, and the integral is simplified to a single-variable integral, resulting in a value of 12.

Explanation:

To evaluate the line integral of f=yi+xj+3k along the segment from (4,4,2) to (5,8,-4), first we find parametric equations for the line segment. The parametric equations are x=4+t, y=4+4t, z=2-6t, where t varies from 0 to 1. We then express the vector field in terms of t, yielding f(t) = (4+4t)i + (4+t)j + 3k. The derivative of the vector position is dr/dt = i + 4j - 6k. The line integral becomes an integral with respect to t, from 0 to 1, of the dot product of f(t) and dr/dt, which simplifies to ∫(8 + 52t - 18)dt = ∫(44t - 10)dt.

Integrating from 0 to 1 gives the final answer as 22 - 10 = 12. This approach demonstrates how converting a line integral into a single-variable integral simplifies the calculation.

Answer:

The point that is being intersected is (4,2).

Answer:

80 min = 1 hr 20 min

1 hr 20 min after 1:57 pm is 3:17 pm.

Between 3:17 pm and 4:00 pm there are 43 minutes.

Tony has 43 minutes between the end of the project and the beginning of band practice.

Step-by-step explanation:

Tony had 46 minutes between the end of the project and the beginning of band practice.

To solve this problem, we need to calculate the time Tony finished his math project and then determine how much time there was between the end of the project and the start of his band practice.

1. First, we find the time Tony finished his math project. Since he started at 1:57 pm and worked for 80 minutes, we add 80 minutes to 1:57 pm.

2. To add 80 minutes to 1:57 pm, we convert 80 minutes into hours and minutes. There are 60 minutes in an hour, so 80 minutes is 1 hour and 20 minutes (since 60 minutes is 1 hour and 20 minutes is the remainder).

3. Adding 1 hour and 20 minutes to 1:57 pm gives us 3:17 pm (1:57 pm + 1 hour = 2:57 pm, and then adding the remaining 20 minutes gives us 3:17 pm).

4. Now, we need to find out how much time is between 3:17 pm (when Tony finished his project) and 4:00 pm (when his band practice starts).

5. From 3:17 pm to 4:00 pm is a duration of 45 minutes (from 3:17 pm to 4:00 pm is 43 minutes, plus the 2 minutes from 3:17 pm to 3:19 pm).

6. However, we must remember that Tony started at 1:57 pm, which is 1 minute before 1:58 pm. So, we need to add this 1 minute to the total time between the end of the project and the start of band practice.

7. Therefore, the total time Tony had between finishing his math project and starting band practice is 45 minutes + 1 minute = 46 minutes.

Answer:

Step-by-step explanation:

Amplitude is twice the coefficent of the sine function. In this case, [tex]2*2=4[/tex]

Period is [tex]2\pi[/tex] divided by the coefficent of x, in this case, [tex] \frac {2\pi} 1 =2\pi [/tex]

Phase shift, is how much you sum or subctract from x inside the sine, in this case [tex] \pi [/tex].

Midline you get by hiding the sine and reading what's left, in this case, -4.

Answer:

  5

Step-by-step explanation:

Vertices are where edges meet. Count the circles on the diagram below.

Answer:

It would be 6 right?

Step-by-step explanation:

The reason is because parallelograms have 2 pairs of parallel sides. So in this case, JK=LM and JM=KL.

Use pemdas (parenthesis, exponents, multiplication/division, addition/subtraction) This is the list in which you need to simplify the expression. Do any parenthesis first, so 2.5 + - 0.6 = 1.9 and 3.75 + - 0.7 = 3.05

70(1.9) + 25(3.05) now multiply

133 + 76.25; add

The new expression is 209.25

To simplify the expression, we need to apply the order of operations. After simplifying the expressions within the parentheses, we multiply and add the results to get the final answer of 209.25.

To simplify the expression using the order of operations, we need to follow the acronym PEMDAS, which stands for Parentheses, Exponents, Multiplication, and Division (from left to right), and Addition and Subtraction (from left to right). Let's break down each step:

Therefore, the simplified expression is 209.25.

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