A train traveled 63.75 miles at a rate of 85 miles per hour. Which equation can be used to find h, the number of hours it took the train to travel this distance?

Answer:

63,960 possibilities in total.

Step-by-step explanation:

For the first number, you can choose from 41 different numbers, so there are 41 possibilities.

For the second number, you cannot choose the same as the first one, so you are now limited to 40 possibilities.

For the third number, you are down to 39 possibilities since you cannot pick the same as the first two ones.

So, you have 41 * 40 * 39 = 63,960 possibilities in total.

Picking a new combination is easy... remembering it is the hard part :-)

If you want to calculate it from a formula standpoint, the base formula would be:

[tex]P(n,r) = \frac{n!}{(n-r)!} = \frac{41!}{(41-3)!} = 63960[/tex]

Where n is the total numbers possible and r is the quantity of numbers you have to pick.

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Answer:

Your answer would be $34.

____________________________________________________

Step-by-step explanation:

In order to get the mean cost that she wants from the gift, we would need to get the numbers that we already had, and have another set of row with the amount of gifts she needs with the mean she wants.

Here is how it should look like:

$25  $14  $33  $19    x

$25  $25  $25  $25 $25

We are trying to find the number for "x"

Therefore, we would need to use the process of adding, then subtracting after.

Lets add:

[tex]25+14+33+19=91\\\\25+25+25+25+25=125[/tex]

What we would do now is subtract the numbers in order to get the price that Tonya wants from her gift, if she buys another gift.

[tex]125-91=34[/tex]

Tonya should spend $34 on her last gift.

$34 should be your FINAL answer

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Answer:

log(2)

Step-by-step explanation:

property of logs says

Log(60) - Log(30) = Log(60/30) = Log (2)

Answer:

1.20

Step-by-step explanation:

properties of log

log x - log y = logx/logy

The domain of a function is the complete set of possible values of the independent variable.

The cosine function is represented by the expression: y=cos(x), where "x" is the independent function, and "y" the dependent function. So the domain comes to be all the values that "x" can take.

The domain of the cosine function is all the real numbers. All this can be verified by looking at its graph (attached)

Answer:

28.26 cm²

Step-by-step explanation:

It's not the point O, but the circle O.

The area of a circle is given by the formula A = π r²

We already have r (3cm)... so we can plug it directly into the equation:

A = π r² = π 3² = 9π = 28.26 cm²

Answer:

A = 28.27

Step-by-step explanation:

A = π r^2

A = π 3^2

A= π (9)

A = 28.27433

Answer:pies 9 :p

Step-by-step explanation:

36÷4=9

Answer: Obtion B

[tex]P = 1.3e ^ {-0.038t}\\\\P = 2.1e ^ {-0.046t}[/tex]

Step-by-step explanation:

The equation for exponential decay has the following form:

[tex]y = pe ^{-rt}[/tex]

Where

p is the initial population  

r is the rate of decrease

t is time.

In this problem we have to:

The current population of insect A to be 1.3 million and the current population of insect B to be 2.1 million.

So

[tex]p_1 = 1.3[/tex]  in millions

[tex]p_2 = 2.1[/tex]  in millions

We also need the populations of insect to be reduced at a rate of 3.8% and insect to be reduced at a rate of 4.6%.

so:

[tex]r_1 = 0.038\\\\r_2 = 0.046[/tex]

then the exponential decay equation for insect A is:

[tex]P = 1.3e ^ {-0.038t}[/tex]

the exponential decay equation for insect B is:

[tex]P = 2.1e ^ {-0.046t}[/tex]

Finally, the system of equations is:

[tex]P = 1.3e ^ {-0.038t}\\\\P = 2.1e ^ {-0.046t}[/tex]

The answer is the Option B

2x^2+10x-3x-15= 2x^2+7x-15

Answer:

2x^2+10x-3x-15= 2x^2+7x-15

Step-by-step explanation:

Answer:

B. 1184

Step-by-step explanation:

Answer is B

See photo

Answer:

-3/5

Step-by-step explanation:

you can use the formula [tex]\frac{y_2-y_1}{x_2-x_1}[/tex] to find the slope of a line when given two points.

we are given both the x and y intercepts, and we can use those in the formula.

the x intercept is (5,0) and the y intercept is (0,3)

i will treat (5,0) as my x1 and y1, and (0,3) as my x2 and y2

[tex]\frac{3-0}{0-5}[/tex] = -3/5

the slope is -3/5

The slope of the line is -3/5 if the line p has an x-intercept of 5 and a y-intercept of 3.

A straight line is a combination of endless points joined on both sides of the point.

The slope 'm' of any straight line is given by:

[tex]\rm m =\dfrac{y_2-y_1}{x_2-x_1}[/tex]

We have a line p:

The x-intercept of line p is 5 or (5, 0)

The y-intercept of line p is 3 or (0, 3)

The slope m can be evaluated:

[tex]\rm m =\dfrac{3-0}{0-5}[/tex]

m = -3/5

Thus, the slope of the line is -3/5 if the line p has an x-intercept of 5 and a y-intercept of 3.

Learn more about the slope of the straight line here:

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Answer:

C.15+25y

Step-by-step explanation:

5(3+5y) solved via distribution is 15+25y

Happy to help :D

C. Because 5(3+5y) is the same as 5x3 plus 5x5y which is 15 + 25y

The answer is D. you would do 0.25 x 6.5. you add 2 to the original needed batches of 4.5.

Answer:

1.125 (A)

Step-by-step explanation:

First you multiply 0.25 x 4.5=1.125

Answer:

(7x-5)(7x+5)

Step-by-step explanation:

Answer:

(7x + 5)(7x - 5)

Step-by-step explanation:

49x² - 25 ← is a difference of squares and factors in general as

a² - b² = (a + b)(a - b)

49x² = (7x)² ⇒ a = 7x

25 = 5² ⇒ b = 5

49x² - 25

= (7x)² - 5² = (7x + 5)(7x - 5)

Answer:

Have the same vertex , and be congruent.

Step-by-step explanation:

Answer:Have the same vertex , and be congruent.

Step-by-step explanation:

Answer:

56.5 inches

Step-by-step explanation:

We are given the area of a circle and we are to find the circumference of the same circle.

We know that the area of a circle is given by [tex]\pi r^2[/tex] so equating the given value to get.

[tex]\pi r^2=254.47[/tex]

[tex]r^2=\frac{254.47}{\pi }[/tex]

[tex]r=\sqrt{81.00}[/tex]

r = 9 inches

Since we now know the radius of the circle so we can find its circumference.

Circumference of circle = [tex]2\pi r[/tex] = [tex]2\pi (9)[/tex] = 56.5 inches

Answer: 56.54 in

Step-by-step explanation:

The area can be calculated with this formula:

[tex]A=\pi r^2[/tex]

Where r is the radius

And the circumference can be calculated with this formula:

[tex]C=2\pi r[/tex]

 Where r is the radius

Solve for the radius from  [tex]A=\pi r^2[/tex]. Then, tha radius is:

[tex]r=\sqrt{\frac{A}{\pi }}=\sqrt{\frac{254.47in^2}{\pi }} =9in[/tex]

Then, the circumference is:

 [tex]C=2\pi (9in)=56.54in[/tex]

Answer:

[tex]\frac{4}{5}[/tex]

Step-by-step explanation:

Given

sinΘ = [tex]\frac{3}{5}[/tex] = [tex]\frac{opposite}{hypotenuse}[/tex]

Then the hypotenuse = 5 and one leg of the right triangle is 3

Using Pythagoras' identity to find the second leg (x)

x² + 3² = 5²

x² + 9 = 25 ( subtract 9 from both sides )

x² = 16 ⇒ x = 4

cosΘ = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{4}{5}[/tex]

Answer:

Step-by-step explanation:

Rent, wages and car insurance don't vary much.  Grocery expenses depend upon the particular groceries purchased each time one goes to the grocery store, and are least likely to be steady / constant from week to week.

Step-by-step explanation:

[tex]r>-11\qquad\text{change the signs}\\\\\boxed{-r<11}\qquad\text{multiply both sides by 3}\\\\\boxed{-3r<33}\\\\r>-11\qquad\text{multiply both sides by 3}\\\\\boxed{3r>-33}[/tex]

Answer:

A

C

D

Step-by-step explanation:

Answer:

The answer is 18.2.

Hope this helps!

Answer: 18.2

Step-by-step explanation:

you would round to 18.2 because with 5 and above, you give it a shove, 4 and below let it go

Answer:

Step-by-step explanation:

Note that the reciprocal of tan B is by definition the cotangent (cot) of B:

   1                        adjacent side           BC

---------- = cot B = ----------------------- =  ---------

 tan B                   opposite side            AC

Answer:

Hence, The reciprocal of tan B is tan A

B is correct.

Step-by-step explanation:

We are given a right angle triangle. Right angle at ∠C

We need to find the reciprocal of tan B

First we write the formula of tan B using trigonometry identity.

[tex]\tan\theta=\dfrac{\text{Opposite}}{\text{Base}}[/tex]

In ΔABC, ∠C=90°

[tex]\tan B=\dfrac{AC}{BC}[/tex]

Now we reciprocal it.

[tex]\dfrac{1}{\tan B}=\dfrac{BC}{AC}[/tex]

[tex]\tan A=\dfrac{BC}{AC}[/tex]

Comparing both equation ( Right sides equal )

[tex]\dfrac{1}{\tan B}=\dfrac{BC}{AC}=\tan A[/tex]

[tex]\dfrac{1}{\tan B}=\tan A[/tex]

Hence, The reciprocal of tan B is tan A.

The expression sin x / csc x + cos x / sec x simplifies to sin^2 x + cos^2 x by using the reciprocal identities of the trigonometric functions csc x and sec x.

The expression sin x / csc x + cos x / sec x can be simplified by substituting the reciprocal identities for the trigonometric functions csc x and sec x. The reciprocal of csc x is sin x and the reciprocal of sec x is cos x. Thus, sin x / csc x becomes sin x / (1/sin x) which simplifies to sin^2 x. Similarly, cos x / sec x becomes cos x / (1/cos x) or cos^2 x. Therefore, the simplified form of the expression is sin^2 x + cos^2 x.

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Answer:

3a-7

Step-by-step explanation:

2(2a-5)-(a-3)

Distribute the 2

2*2a -2*5 - (a-3)

4a -10 - (a-3)

Distribute the minus sign

4a-10 -a +3

Combine like terms

4a-a -10+3

3a-7

Answer:

(0,0), (0,9), (9,0)

Step-by-step explanation:

The matrix corresponding vertices are:

(0,0)

(0,3)

(3,0)

Rosa scales by 3T, so we need to multiply each point by 3.

(3*0, 3*0)

(0*3, 3*3)

(3*3, 0*3)

=

(0,0)

(0,9)

(9,0)

last answer choice is right.

Answer:

[tex]\large\boxed{(0,\ 0),\ (0,\ 9),\ (9,\ 0)}[/tex]

Step-by-step explanation:

[tex]n\cdot\left[\begin{array}{ccc}a&b&c\\d&e&f\end{array}\right] =\left[\begin{array}{ccc}(n)(a)&(n)(b)&(n)(c)\\(n)(d)&(n)(e)&(n)(f)\end{array}\right] \\\\============================[/tex]

[tex]\text{We have:}\\\\T=\left[\begin{array}{ccc}0&0&3\\0&3&0\end{array}\right] \Rightarrow\text{vertex}\ (0,\ 0),\ (0,\ 3),\ (3,\ 0)\\\\-----------------------------\\\\3T=\left[\begin{array}{ccc}(3)(0)&(3)(0)&(3)(3)\\(3)(0)&(3)(3)&(3)(0)\end{array}\right] =\left[\begin{array}{ccc}0&0&9\\0&9&0\end{array}\right] \\\\\text{new vertex:}\ (0,\ 0),\ (0,\ 9),\ (9,\ 0)[/tex]

Answer:

16

Step-by-step explanation:

h(x) × h(x) = (6 - x)²

(h × h)(10) = (6 - 10)² = (- 4)² = 16

For this case we have by definition, that given two functions, then:

[tex](f * g) (x) = f (x) + g (x)[/tex]

Here, we want to find ([tex](h * h) (x):[/tex]

[tex](h * h) (x) = (6-x) (6-x)\\(h * h) (x) = 36-6x-6x + x ^ 2\\(h * h) (x) = 36-12x + x ^ 2[/tex]

We want to find the value of the function when [tex]x = 10[/tex].

[tex](h * h) (10) = 36-12 (10) + (10) ^ 2\\(h * h) (10) = 36-120 + 100\\(h * h) (x) = 16[/tex]

Answer:

[tex](h * h) (x) = 16[/tex]

Answer:

Those are trigonometric identities. and tan is just a shortened version of tangent, same for cos is means cosine

   The sine/sin of the angle = the length of the opposite side divided by the length of the hypotenuse.

   The cosine/cos of the angle = the length of the adjacent side divided by the length of the hypotenuse.

   The tangent/tan of the angle = the length of the opposite side divided by the length of the adjacent side.

Answer:

[tex]\large\boxed{\sqrt{20}-\sqrt{80}=-2\sqrt5}[/tex]

Step-by-step explanation:

[tex]\text{Use}\ \sqrt{ab}=\sqrt{a}\cdot\sqrt{b}\\\\\sqrt{20}=\sqrt{4\cdot5}=\sqrt4\cdot\sqrt5=2\sqrt5\\\\\sqrt{80}=\sqrt{16\cdot5}=\sqrt{16}\cdot\sqrt5=4\sqrt5\\\\\sqrt{20}-\sqrt{80}=2\sqrt5-4\sqrt5=(2-4)\sqrt5=-2\sqrt5[/tex]

Answer:

Step-by-step explanation:

Here's how I would do it (not necessarily the only way or best way).

Draw an imaginary line from A to C.  This splits the kite into two triangles: ABC and ADC.  Since AB ≅ AD, CB ≅ CD, and AC ≅ AC, the two triangles must be congruent by SSS.  Therefore, ∠B ≅ ∠D.

There are 11 letters in "probability"

There are two B's and two I's

11!/(2!2!) = 9,979,200

hope that helps. please name me brainliest

Answer:

8

6

Using all the letters of the word ARRANGEMENT how many different words using all letters at a time can be made such that both A, both E, both R both N occur together .

Hope this helps <3<3<3 Aaliyah

Step-by-step explanation:

Answer:

Final answer is $4440.

Step-by-step explanation:

Let amount of money invested in 8% stock = x

Let amount of money invested in 6% stock = y

then total money invested $325.6 gives equation

8% of x + 6% of y = 325.6

0.08x + 0.06y = 325.6

8x + 6y = 32560...(i)

other equation will be x=2y...(ii)

plug (ii) into (i)

8x + 6y = 32560

8(2y) + 6y = 32560

16y+ 6y = 32560

22y = 32560

[tex]y=\frac{32560}{22}[/tex]

y=1480

plug y=1480 into (ii)

x=2y=2(1480)=2960

Then total money invested in stocks = x+y= 1480+2960=4440

Hence final answer is $4440.

Answer:

5.4 ft²

Step-by-step explanation:

Since the circle is inscribed in the square then radius r = 2.5

Area of yellow = area of square - area of circle

A = (5 × 5) - (π × 2.5²)

  = 25 - 6.25π ≈ 5.4 ft²

Answer:

Area of the Yellow Region is 5.4 ft²

Step-by-step explanation:

Given:

Length of the side of the square = 5 ft

Diameter of the Circle = Length of the side = 5 ft

⇒ Radius of the circle, r = 5/2 = 2.5 ft

To find: Area of the Yellow region from the figure.

Area of the Yellow Region = Area of the Square - Area of the Circle

                                            = Side × Side - πr²

                                            = 5 × 5 - 3.14 × (2.5)²

                                            = 25 - 3.14 × 6.25

                                            = 25 - 19.625

                                            = 5.375

                                            ≈ 5.4 ft²   (nearest tenth)

Therefore, Area of the Yellow Region is 5.4 ft²