Two trains started moving at the same time, train A from Boston to New York, and train B from New York to Boston. The distance between the train stations in New York and Boston is 240 miles. The average speed of train A is 60 mph, which is 3/4 of the average speed of train B.

How soon will the trains meet?

Answer:

32°

Step-by-step explanation:

Since the outer angle is 99°, the interior angle must be 180° - 99°. That is 81°. We then do the same for the outer angle 113°. So 180° - 113° is 67°. Since the angles of the interior angles must equal 180°, we add 81° and 67°. That equals 148°. Now to figure out x, 180° - 148° is 32°. I hope this helps! Please mark me brainliest!

x-intercept(s):  (1/2, 0) or (0.5, 0)

y-intercept(s):  (0,  −2)

The number is always 2, the type depends on the discriminant.

For a general quadratic equation:

ax² + bx + c = 0

We can define the discriminant as:

D = b² - 4ac

And we can have 3 cases:

if D > 0, the quadratic equation has 2 real solutions.

if D = 0, the quadratic has two (equal) real solutions.

if D < 0, the quadratic has 2 complex solutions.

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Answer:

narrower

Step-by-step explanation:

Answer:

it's will have happened

Step-by-step explanation:

I got it right

Answer:

The length of the sides of the square is 9.0015

Step-by-step explanation:

Given

The diagonal of a square = 12.73

Required

The length of its side

Let the length and the diagonal of the square be represented by L and D, respectively.

So that

D = 12.73

The relationship between the diagonal and the length of a square is given by the Pythagoras theorem as follows:

[tex]D^{2} = L^{2} + L^{2}[/tex]

Solving further, we have

[tex]D^{2} = 2L^{2}[/tex]

Divide both sides by 2

[tex]\frac{D^{2}}{2} = \frac{2L^{2}}{2}[/tex]

[tex]\frac{D^{2}}{2} = L^2[/tex]

Take Square root of both sides

[tex]\sqrt{\frac{D^{2}}{2}} = \sqrt{L^2}[/tex]

[tex]\sqrt{\frac{D^{2}}{2}} = L[/tex]

Reorder

[tex]L = \sqrt{\frac{D^{2}}{2}}[/tex]

Now, the value of L can be calculated by substituting 12.73 for D

[tex]L = \sqrt{\frac{12.73^{2}}{2}}[/tex]

[tex]L = \sqrt{\frac{162.0529}{2}}[/tex]

[tex]L = \sqrt{{81.02645}[/tex]

[tex]L = 9.001469325[/tex]

[tex]L = 9.0015[/tex] (Approximated)

Hence, the length of the sides of the square is approximately 9.0015

Answer:

Step-by-step explanation:

We want to isolate m in the formula KE=0.5mv^2.  To do this, divide both sides by 0.5v^2:

               KE

m = ----------------------

                 v^2

Answer:

10

Step-by-step explanation:

just add

Answer:

When xy are zero multiply by 1.33 and we will find y only if x =70

So the linear function will be

y =  90/0 = 0    =   y = x/0

y =   90/2 = 2    =   y = x/2

y =    90/4 = 4   =  y = x/4

y =    90/8 = 6   = y = x/8

x=90  y = 60 when both = 0

Or we can reverse and do x2+2 and call train f(x) and train = x = 90.

Step-by-step explanation:

70/90 = 0.77  =  70 x 1.33 = 90 as a fraction percentage 77%

60/45= 1.33  =  70 x 1.33 = 90 / 2 = 45   ( and as 22.5 as a fraction percentage 133/3%)

50/22.5=2.22  =  70 x 1.33 = 90/4 = 22.5 as a fraction percentage  222.2%

40/11.25=3.55 =  70 x 1.33 = 90 /8 = 11.25  as a fraction percentage= 355.5%

Answer:

1            0.25

2            0.50

3            0.75

5            1.25

7            1.75

9            2.25

11            2.75

12           3.00

t=0.25s

Answer:

900

Step-by-step explanation:

To get your answer, you can just multiply 20 seconds by 3 to get 60 seconds, which is a minute.

Since whatever you do on one side you have to do to the other, multiply 300 mi by 3 as well. That would get you 900.

Answer:

{4, 20}

Step-by-step explanation:

x2 − 24x = −80

divide -24 by 2  and square result   get 144

x^2 - 24x  + 144 =  -80 + 144

(x - 12)^2  =  64

x - 12 = root (64)

x = 12 + 8  or  x = 12 - 8

x = 20 or 4

The solution set of the considered quadratic equation x^2 − 24x = −80 is given by: Option B: {4,20}

The method "completing the squares", as per the name suggests, try to make the quadratic equation of the form such that the x variable is totally covered in single squared term, as the square of a linear expression in x.

The quadratic equation would look something like:

(px + q)^2 = s

where p, q and s are some constants.

We do so, so that we can then use square root and some other operations to get the variable 'x' on one side of the equation, and all the constants on the other side, being solution of the considered  quadratic equation.

Expressing the quadratic equation in such form converts the form of the equation which contains 'x' with different powers in different term to a form which contains 'x' single time.

Suppose that two terms are 'a' and 'b'.

Then, their sum's square is expanded as:

[tex](a+b)^2 = a^2 + 2ab + b^2[/tex]

For this case, the equation considered is :

[tex]x^2 -24x = -80[/tex]

Comparing the left side with [tex]a^2 + 2ab + b^2[/tex], we see that we can use a = x.

Let we try to make the considered equation look more like the equation  [tex]a^2 + 2ab + b^2[/tex] .

[tex]x^2 -24x = -80\\x^2 -2(12)x = -80\\x^2 -2(12)x + 12^2 -12^2 = -80\\x^2 -2(12)x + 12^2 = -80 + 12^2 = 64\\[/tex]

Now, we can use [tex](a+b)^2 = a^2 + 2ab + b^2[/tex] for the left sided expression, as shown below:

[tex]x^2 -2(12)x + 12^2= 64\\\\(x-12)^2 = 64[/tex]

Taking square root, we get:

[tex]\sqrt{(x-12)^2} = \sqrt{64}\\\\(x-12) = \sqrt{(\pm 8)^2} = \pm 8\\or\\\\x = 12 \pm 8\\x = 12+8, x = 12-8\\x = 20, x = 4[/tex]

Thus, the solution set of the considered quadratic equation x^2 − 24x = −80 is given by: Option B: {4,20}

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Answer:

C

Step-by-step explanation:

Since they left a tip of 20% you find 20% of 25.60, and then add it to 25.60.

You add 5.12 and 25.60 because it was a tip, they gave that much more.  

So 20% which is 5.12.  

25.60 + 5.12 = 30.72

since there were 3 people in total you just divide

30.72 / 3

= 10.24

The CD that compounds more frequently will pay more interest; thus, monthly compounding yields more interest than quarterly, which in turn is more than semi-annually, with annual compounding paying the least.

When comparing the different compounding frequencies for a Certificate of Deposit (CD) with the same annual interest rate, the compounding option that pays more interest is the one that compounds more frequently. Compounding can occur on an annual, semi-annual, quarterly, or monthly basis. The more frequently the interest is compounded, the greater the amount of interest will be earned because each compounding period, the interest is calculated on the initially invested amount plus the previously earned interest.

For example, if interest is compounded monthly, it will be compounded 12 times a year, and each month's interest will begin to earn interest in subsequent months. Similarly, if interest is compounded quarterly, it will be compounded 4 times a year, and semi-annually compounding will occur twice a year. The least frequent is annually compounding, with only one compound per year.

Therefore, the CD that compounds monthly will pay the most interest, followed by the one that compounds quarterly, then semi-annually, and the least will be the CD that compounds annually, assuming the nominal interest rate is the same for all.

Answer:-40

Step-by-step explanation:

Because that means below 0

Answer:

10

Step-by-step explanation:

Answer:

A =One-half(2πr)(r)

Step-by-step explanation:

i got it right!

The approximate representation of the area of a parallelogram like figure is as follows:

The circle is cut into 8 equal pieces and used to create a shape that resembles a parallelogram.

Circumference of a circle is the perimeter of the circle.

Area of parallelogram = bh

Where

b = base

h = height

Therefore,

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Answer:

x = 60°

Step-by-step explanation:

The circle is 360°, thus

2y + y = 360

3y = 360 ( divide both sides by 3 )

y = 120°

The tangent- secant angle ABT is one half the measure of the intercepted arc AB, thus

x = 0.5 × 120° = 60°

Answer:

a = 3

Step-by-step explanation:

Simply substitute 2 for x and y for 1 and solve.

This will get you 2a + 2 = 8

Then simplifying, 2a = 6.

a = 3.

The value of a and the coefficient of x is 3.

Substitution means putting numbers in place of letters to calculate the value of an expression .

According to the given question.

We have a equation.

ax + 2y = 8.

Also, the solution to the equation is (2, 1).

So, substitute x = 2 and y = 1 in the equation ax + 2y = 8.

⇒ [tex]a(2) + 2(1) = 8[/tex]

⇒ [tex]2a + 2 = 8[/tex]

⇒ [tex]2a = 8-2[/tex]   ( subtracting 2 from both the sides)

⇒ [tex]2a = 6[/tex]

⇒ [tex]a = \frac{6}{2}[/tex]    (dividing both the sides by 2)

⇒ [tex]a = 3[/tex]

Hence, the value of a and the coefficient of x is 3.

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Answer: 7.7%

Step-by-step explanation: First find the increase in height by subtracting 52 from 56. 56-52=4.

To find what percent this is of 52, divide 4 by 52. 4/52=0.0769. Then convert this from a decimal to a percent by multiplying by 100. 0.0769*100=7.69.

I just rounded it to the nearest tenth, you can change it how you need to.

Final answer:

The percent of increase in Angelica's height over one year, from 52 inches to 56 inches, is approximately 7.69%.

Explanation:

The student is asking how to calculate the percent of increase in height over a one year period. We start by finding the initial and final measurements, then calculate the increase and convert it to a percentage.

Angelica's initial height is 52 inches, and her final height after one year is 56 inches. The increase in height is 56 inches - 52 inches, which equals 4 inches. To find the percent increase, use the formula:

Percent increase= (Increase / Original amount) x 100

So, the calculation is

Percent increase= (4 / 52) x 100 = 7.69%

Therefore, the percent increase in Angelica's height is approximately 7.69%.

Answer:

The probability that both of the selected marbles are red is [tex]\frac{3}{28}[/tex]

Step-by-step explanation:

Given

Number of red marbles = 3

Number of blue marbles = 5

Required

Probability of selecting two red marbles (without replacement).

First, we need to get the total number of marbles

Total = Red Marbles + Blue Marbles

Total = 3 + 5

Total = 8

Probability is calculated by: Number of required outcome divided by number of possible outcome.

Since there are 3 red marbles out of a total of 8 marbles;

The probability that the first marble you selected is red is 3/8

From the question, you didn't return the marble back to the container.

This means that, there are 2 red marbles and a total of 7 marbles left in the container.

So, the probability that the next marble selected is red is 2/7

Let P(R and R) represent the probability of selecting two red marbles.

This is calculated by multiplying the probability of picking the first red marble and the second red marble.

Hence,

P(R and R) = [tex]\frac{3}{8} * \frac{2}{7}[/tex]

P(R and R) = [tex]\frac{6}{56}[/tex] --- Reduce to lowest term

P(R and R) = [tex]\frac{3}{28}[/tex]

Hence, the probability that both of the selected marbles are red is [tex]\frac{3}{28}[/tex]

Answer:

25.13

Step-by-step explanation:

C=2πr

C=2 x 3.14 x 4

C= 25.13

Answer:

-3/4 or -0.75

Step-by-step explanation:

You go down 6, over 8.

6/8=3/4

It's a negative slope, so the rate of change is -3/4 or -0.75.

Answer:

50.24 m^2

Step-by-step explanation:

Area of a circle = Pi r^2

Pi = 3.14

Diameter = 8 m

Radius r = diameter/2 = 8/2

= 4

Therefore

Area = 3.14 x 4^2

= 3.14 x 4 x 4

= 50.24 m^2

Answer:

Function: y= 15x + 50

or f(x)=15x+50

Answer:

f(x)=15x+50

Step-by-step explanation:

since her grandmother gave her $50 once you just add it to the problem, and she's collecting $15 every week meaning 15x.

Answer:

The answer is that each book costs 26 dollars

Step-by-step explanation:

First we subtract 199 dollar from 7 =182

Then we divide 182 dollars to the seven book in order to find a unit =182/7=26

To prove this answer multiply 26 dollars than 7 books and see if the outcome is 182.Then subtract 199 from 182 and see if you got 17.

Answer:

eight thousand four hundred and nine tenths

Hope this helps!

The 'Storm Tracker Portfolio Worksheet' likely entails exercises related to tracking weather systems, and this can be part of a geography or earth science curriculum in high school. It seeks to enrich students' understanding of weather systems, including Space Weather such as Sun storms.

Given that your query refers to a 'Storm Tracker Portfolio Worksheet,' it's presumed that this refers to lessons on tracking weather patterns and phenomena, linking to geography and earth science. In this context, it's important to note that these activities usually entail analyzing and predicting weather system developments, including storms brought about by  Space Weather such as those on the Sun.

The 'Storm Tracker Portfolio Worksheet' may include exercises like noting down storm paths, examining storm frequencies, interpreting storm system scenarios, among others. The ultimate goal of this exercise is to deepen students' comprehension of how weather systems and various atmospheric conditions affect our planet.

Each person's worksheet may differ based on their geographical location and the specific details needed to be observed and outlined at a given time. It would be helpful to refer to the instruction set provided along with your worksheet to understand what is required of you and what to look out for when completing the worksheet.

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Answer:

x2(x+4)-9(x+4)

Step-by-step explanation:

=(x2-9)(x+4)

Answer: D or (x²– 9)(x + 4).

The next one is A (difference-of-squares)

The last one is C (x + 3)(x – 3)(x + 4)

Step-by-step explanation: Edge '21