Find the value of k so that 48x-ky=11 and (k+2)x+16y=-19 are perpendicular lines.

Answers

Answer 1

Answer: k = -1 +/- √769

Step-by-step explanation:

48x - ky = 11

-48x           -48x

         -ky = -48x + 11

         [tex]\frac{-ky}{-k} = \frac{-48x}{-k} + \frac{11}{-k}[/tex]    

           [tex]y =\frac{48x}{k} - \frac{11}{k}[/tex]

Slope: [tex]\frac{48}{k}[/tex]

*************************************************************************

 (k + 2)x + 16y = -19

- (k + 2)x             -(k + 2)x

                 16y = -(k + 2)x - 19

                  [tex]\frac{16y}{16} = -\frac{(k + 2)x}{16} - \frac{19}{16}[/tex]

                  [tex]y = -\frac{(k + 2)x}{16} - \frac{19}{16}[/tex]

Slope: [tex]-\frac{(k + 2)}{16}[/tex]

**********************************************************************************

[tex]\frac{48}{k}[/tex] and [tex]-\frac{(k + 2)}{16}[/tex] are perpendicular so they have opposite signs and are reciprocals of each other.  When multiplied by its reciprocal, their product equals -1.

[tex]-\frac{(k + 2)}{16}[/tex] *  [tex]\frac{k}{48}[/tex] = -1

[tex]\frac{(k + 2)k}{16(48)}[/tex] = 1

Cross multiply, then solve for the variable.

(k + 2)(k) = 16(48)

k² + 2k - 768 = 0

Use quadratic formula to solve:

k = -1 +/- √769




Related Questions

Select an equivalent form of this equation: x/12 - 7 = x/4

Answers

Final answer:

To solve the equation x/12 - 7 = x/4, multiply all terms by 12 to eliminate the fractions. Simplify the equation and solve for x by isolating the variable.

Explanation:

To solve for x, we need to find an equivalent form of the given equation. First, let's get rid of the fractions by multiplying all terms by 12 (the common denominator).

After multiplying, we get 12(x/12) - 12(7) = 12(x/4), which simplifies to x - 84 = 3x.

Next, subtract x from both sides of the equation to isolate the variable. This gives us -84 = 2x.

Finally, divide both sides of the equation by 2 to solve for x. The equation becomes -42 = x. Therefore, an equivalent form of the given equation is x = -42.

An investment firm wants to create a billboard that displays an enlarged $1,000,000 bill. The actual size of the bill is 2.61 inches by 6.14 inches. If the billboard is 48 feet wide, what's the scale of the bill to the billboard? A. 1′ = 8.71″ B. 1′ = 7.81″ C. 1″ = 8.71′ D. 1″ = 7.81′

Answers

We know how wide the billboard will be. Therefore, to know how much the original image should be enlarged, you must divide the final width of the billboard between the current width of the invoice.

We know both data, then we perform the operation:

48 feet /6.14 inches = 7.81 feet / inches .


Therefore the correct answer is option D. 1″ = 7.81′

For the bill to cover the billboard, the bill must be expanded by a factor of 7.81 feet long per inch long that has the original image.

Why do the ratios of sine and cosine depend upon the angle being a part of a right triangle?

Answers

Step-by-step explanation:

Think of a right triangle (refer the attached image).  If you increase or decrease the length of  one of its legs, while keeping the other leg the same (the hypotenuse  will increase as well) here we have increased the length of the perpendicular side.  You can see that the *subtending*  angle (the angle which is opposite to the increasing leg, x) gets larger,  while the *adjacent* angle (the angle with the increasing leg as one  of its rays) will decrease.  

and we know that:

[tex]\sin x=\frac{AB}{AC}[/tex] and [tex]\cos x=\frac{BC}{AB}[/tex] in both the cases the variation of AB is causing the angles to change hence, the ratios of sine and cosine depend upon the angle being a part of a right triangle.



What is the range of f(x)?

{ f(x)| –∞ < f(x) < ∞}
{ f(x)| –∞ < f(x) ≤ 4}
{ f(x)| 4 < f(x) < ∞}
{ f(x)| 0 ≤ f(x) < ∞}


Answers

Answer:

best ans is { f(x)| –∞ < f(x) ≤ 4}

Step-by-step explanation:

usually to find the range of a fn, u need to see what the value can be. the graph show only a small range of x values. but u can see f(x) is definitely <  4. so the ans is { f(x)| –∞ < f(x) ≤ 4}


The range of the graph will be (–∞, 4]. Then the correct option is B.

What are domain and range?

The domain means all the possible values of x and the range means all the possible values of y.

From the graph, we can conclude that the curve gets saturated at y = 4 and as the value of x approached to infinity, the value of y approach to negative infinity.

The range of the graph will be (–∞, 4].

Then the correct option is B.

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How is 10 2/3 written as a decimal to the nearest hundreth?

Answers

How is 10 2/3 written as a decimal to the nearest hundreth?


Answer is 10.2/3 because you round it to the hundreth?

The scale of a model train is 1 inch to 13.5 ft . One of the model trains is 5 inches long what is the length in feet of the actual train car

Answers

 1 in: 13.5 ft

 x5       x5

5 in : 67.5 ft

Answer: 67.5 ft

Danny makes $8.75 per hour and works 32 hours per week but 18 percent is withheld from each paycheck for taxes. If Danny's monthly expenses total $595 per month and he is able to save the rest, approximately how much could Joe save in one year?

Answers

the answer should be $4799.20

First we need to find Danny's yearly net income or how much he makes after taxes. $8.75 per hour. He works 32 hours a week. Multiply those together and we get $280 per week. Now divide by seven for daily income. That results in $40 a day. Then multiply by 365 to get $14600 a year. Now to account for taxes. 18% is withheld for taxes which means 82% is not. $14600 multiplied by .82 is $11972, and that's our net income.

Now we need to subtract expenses. $595 a month is the same as $7140 a year. Subtract that from $11972 and we get $4832 left over, and that's our answer.

Why do you multiply the tax and the money 3.38 aren’t you supposed to add

Answers

The tax is simply the percentage of the amount you paid stacked on top of your total to go to the government. So you'd have your total, multiply the tax, and add that amount to your total.

Order this set of numbers from least to greatest: 2.51, 2.3, 2.15

Answers

2.15 2.3 2.51 least to greatness
2.51 2.3 2.51hdhjdjdjjd

If 1 mile is equal to 1.61 kilometers, how many kilometers are there in 50 miles

Answers

There are 80.5 kilometres in 50 miles.

1 mile= 1.61 km

50 miles= x

1x= 50*1.61

x=80.1

80.1 kilometers

A company can produce as many as 50 mountain bikes and as many as...

Answers

The other constrain would be the number of hours it takes to make each one.

4 hours for a mountain bike would be 4x

5 hours for a road bike would be 5y

The hours need to be less than or equal to a total of 300 hours.


The missing constraint would be 4x + 5y ≤ 300.

Answer:

4x + 5y ≤ 300

Step-by-step explanation:

x: no of mt bike n y: no. of road bike

4 labor hrs for 1 mt bike n 5 labor hrs for 1 road bike

company has at most 300 labor hrs per day

so the contraint is 4x + 5y ≤ 300


Ruben bought 6 new book which increased his collection by 12%. How many books did he have?

Answers

The correct answer is 56:)

Answer:

The initial number of books he had=50

The number of books he has after adding new books=56

Step-by-step explanation:

Step 1: Derive formula for percentage increase

The formula for calculating the percentage increase is;

p={(f-i)/i}×100

where;

p=the percentage increase

f=the final number of books he had

i=the initial number of he had

In our case;

p=12%

(f-i)=defines the increase in the number of books=6

i=unknown

Substitute and solve for i;

12%=6/i

(12/100)=6/i

(12/100)×i=6

i=6×100/12

i=50

The initial number of books he had=50

The number of books he has after adding new books=50+6=56

In 2012,five u.S. Postal stamps cost money 2.20.How much did seven stamps cost

Answers

2.20 ÷ 5 = .44
.44 × 7 = $3.08 for seven stamps

Answer:

$3.08

Step-by-step explanation:

First you have to find how much each stamp costs. So u take 2.20 ÷ 5 = 0.44.

Next you take 0.44 x 7 and you should get $3.08

-20 less than or equal to 2x -20 less than or equal to 30

Answers

Answer = 0 ≤ x ≤ 25

Explanation:  

Break the word equation into two for better understanding  

-20 less than or equal to 2x -20 >>>> -20 ≤ 2x -20

2x -20 less than or equal to 30 >>>> 2x -20 ≤ 30

Keeping in view the question we deduce the equation  

-20 ≤ 2x -20 ≤ 30

Solve and simplify the above equation accordingly, by breaking down the equation

-20 ≤ 2x -20      and   2x -20 ≤ 30

-20+20 ≤ 2x      and   2x ≤ 30 +20

    0 ≤ x (0/2)    and     x ≤ 25 (50/2)

So,    0 ≤ x ≤ 25


A movie cost $3,254,107 to produce.What digit is in the hundred thousands place?

Answers

The digit that we have is 3,254,107.

To find out what digits are there at hundred and thousands place we need to find out the digits at the respective places.

From the given digit we can see that (we start counting the places from the right i.e 7)

At units place we have 7

At tens place we have 0

At hundreds place we have 1

At thousands place we have 4

So, we have '1' at hundreds place and we have '4' at thousands place.

Nuclear power provided 78% of the energy used in france in 2005. Write 0.78 as a fraction in simplest form.

Answers

Here we are given first that Nuclear power provided 78% of the energy used in france in 2005.

Now this was written in decimal as 0.78.

Then we have to write it in fraction form.

So first we have here two digits after the decimal, so in denominator we will have 100,

[tex]\frac{78}{100}[/tex]

Now we have to convert this into simplest form.

For that we have to find HCF of 78 and 100.

The HCF of 78 and 100 is 2, so we will divide both numerator and denominator by 2,

[tex]\frac{78/2}{100/2}[/tex]

This gives us:

[tex]\frac{39}{50}[/tex]

Answer: The simplest form of 0.78 as as fraction is 39/50.

roberto had 88$, which is eleven times as much money as bianca had. how much money did bianca have?

Answers

The answer is 8.


You divide 88 by 11 to find out how much Bianca haves.

To find the answer, we can set an equation:

Let the amount bianca have be y

11y = 88
y = 8

Alternatively:
88÷11
=8

Therefore, Bianca has 8$.

Hope it helps!

If mrs.Dimas has $130 to buy basketballs for edison middle school.How many can she buy at $15 each?Interpret the remainder

Answers

To find the answer we can simply divide 130 by 15:

130÷15
=8...10

Therefore,she can buy 8 basketball with $10 left.

Hope it helps!

Mrs. Dimas should have $10 left over, you will also be able to buy 8 basketballs.

Which of the following equations describes a line with an x-intercept of 3? A. x + y = −3 B. x − y = −3 C. x = 3

Answers

the answer is c because if x just equals 3 the its going to go straight through 3
Final answer:

The correct equation which describes a line with an x-intercept of 3 is C. x = 3. This implies a vertical line where the x-value is always 3, regardless of the y-value.

Explanation:

In response to your query about which of the following equations describes a line with an x-intercept of 3, the direct answer is C. x = 3. An x-intercept is the point where a line crosses the x-axis. For an equation to have an x-intercept of 3, it means that when y is 0, x equals 3. By plotting this on a graph, y can be any real number, but x will always stay 3. Therefore, the equation x = 3, which option C represents, is the correct description for a line with an x-intercept of 3.

It's important to note that, in terms of linear equations (generally represented as y = mx + b, where m represents the slope and b represents the y-intercept), x = 3 can be perceived as a vertical line that intersects the x-axis at point 3.

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Write me equation for each translation of y = |x| of 6 units down

Answers


[tex]y = |x| - 6[/tex]


Evaluate: 4x (x-2)-3x^2 for x=3

Evaluate: 4x^2-3x+2 for x=2

Simplify -(2x+3y)-4(-x-y)

Answers

1.) 12x - 33

2.) 12

3.) -6x + y

Jill's fish weighs 8 times as much as her parakeet. Together they weight 63 ounces. How much does the fish weight

Answers

f=8p
63=f+p

Use substitution. f is already isolated, so sub the equation 8p into 63=f+p for f.
63=8p+p
63=9p
Divide both sides by 9 to get
p=7
You now have the weight of the parakeet. Multiply 7 by 8 to get the weight of the fish.
f=56

A piece of fabric is 1/3 yard by 3 5/8 yards. Irma solves 1/3⋅3 5/8 to find the area of the fabric in square yards. Enter numbers to complete irma's calculation for the area.

Answers


For this case we have:


The area of the piece of fabric is given by [tex]A = a * b[/tex]


Where


[tex]a = \frac{1}{3}yards[/tex]


[tex]b = 3 \frac{5}{8}yards[/tex]


Substituting in the formula of the area we have:


[tex]A = \frac{1}{3}* 3 \frac{5}{8}\\[/tex]

[tex]A = \frac{1}{3}* (3 + \frac{5}{8})\\[/tex]

[tex]A = 1 + \frac{5}{24}[/tex]


[tex]A = 1\frac{5}{24}yards ^ 2\\[/tex]

Thus, the area of the piece of fabric is given by: [tex]A = 1\frac{5}{24}yards ^ 2\\[/tex]

Answer:


[tex]A = 1\frac{5}{24}yards ^ 2\\[/tex]

1/3 x 3 5/8 = (1/3 x 3) + (1/3 x 5/8)

= 3/3 + 5/24

= 29/24

Gilbert has 50 drywall screws. He is purchasing more screws. He can purchase up to 6 boxes of screws. Each box of screws contains 200 screws. He can't purchase partial boxes. The function that models the number screws Gilbert has is f(b)=200b+50 f ( b ) = 200 b + 50 , where b is the number of boxes he purchases. What is the practical domain of the function?

Answers

Answer:

All integers from 1 to 6 inclusive!

HELP ME PLS
I
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YOU
I
CAN
NOT
FAIL
I
NEED
HELP
PLS
PLEASEEEEEEEEEEEEEEEEEEE!!!!!!!!!!!!!!!!!!!!

Answers

Answer: R' = [tex](3\frac{1}{3} ,1\frac{2}{3})[/tex], S' = [tex](3\frac{1}{3} ,-3\frac{1}{3})[/tex], T' = [tex](-1\frac{2}{3} ,-3\frac{1}{3})[/tex]

Step-by-step explanation:

R = (2, 1)  ⇒  R' = [tex](\frac{5}{3})2 , (\frac{5}{3})1 = (\frac{10}{3} , \frac{5}{3})[/tex]

S = (2, -2)  ⇒  S' = [tex](\frac{5}{3})2 , (\frac{5}{3})(-2) = (\frac{10}{3} , \frac{-10}{3})[/tex]

T = (-1, -2)  ⇒  T' = [tex](\frac{5}{3})(-1) , (\frac{5}{3})(-2) = (\frac{-5}{3} , \frac{-10}{3})[/tex]

Plot the coordinates.

F(n) = 900 - 60(n-1) represent the amount oscar still need to repay on a loan at the beginning of month n .Find the amount oscar pays monthly and the month in which he will make his last payment.

Answers

Answer:Each installment will be of 60 and 16th will be the last payment.


Step-by-step explanation:

To find the monthly repayment by Oscar we first find the sequence.


For that first we put [tex] n=1 [/tex] in

[tex] F(n)=900-60(n-1)[/tex]


[tex] F(1)= 900-60(1-1) = 900 [/tex]


Now for [tex]n=2 [/tex]

[tex] F(2)=900-60(2-1)=840[/tex]


For [tex]n=3[/tex]

[tex] F(3)=900-60(3-1)=900-120=780[/tex]


So the sequenxe is 900,840,780......


As the amount is decreasing by 900-840=840-780=60


Therefore each installment will be equal to 60


For last payment amount will become 0

i.e.[tex]F(n) =0[/tex]


[tex] 900-60(n-1)=0[/tex]


[tex] 900-60n+60=0 [/tex]


[tex] 960=60n [/tex]


[tex]n = 960\div60[/tex]


[tex]n = 16 [/tex]


Last month will be 16th


Final answer:

The amount Oscar pays monthly is $900, and he will make his last payment in month 16.

Explanation:

To find the amount Oscar pays monthly, we can subtract the amount he repays in each month from the previous month's balance. The formula F(n) = 900 - 60(n-1) represents the remaining amount Oscar needs to repay at the beginning of month n. By plugging in n = 1, we can find the initial balance and the amount he paid that month. To find the month in which he makes his last payment, we can set F(n) to zero and solve for n.



Amount Oscar Pays Monthly:

Plug in n = 1 into the formula: F(1) = 900 - 60(1-1) = 900Subtract the balance of the previous month from the current balance: 900 - 0 = 900Oscar pays $900 in the first month.Since the amount Oscar pays each month is constant, he will continue to pay $900 in subsequent months.



Month of Last Payment:

Set F(n) to zero: F(n) = 0Substitute the formula: 900 - 60(n-1) = 0Add 60(n-1) to both sides: 900 = 60(n-1)Divide both sides by 60: 15 = n-1Add 1 to both sides: 16 = nOscar will make his last payment in month 16.

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Amy is using a drawing program to complete a construction with which she is almost finished. Which construction is she completing?

Two intersecting circles are drawn with a radius in each marked. the image will be linked

An equilateral triangle inscribed in a circle
A square inscribed in a circle
A regular pentagon inscribed in a circle
A regular hexagon inscribed in a circle

Answers

Given options : Two intersecting circles are drawn with a radius in each marked. the image will be linked.

Given options : An equilateral triangle inscribed in a circle

A square inscribed in a circle

A regular pentagon inscribed in a circle

A regular hexagon inscribed in a circle.

Note. When we join an intersection point of two circles and centers of the circles it would form an equilateral triangle that would be inscribe inside a common portion of both circles..

Therefore, an equilateral triangle inscribed in a circle would be correct option.

She is completing an equilateral triangle inscribed in a circle.

A local pet store has a total of 72 fish in 9 tanks. Each tank holds the same number of fish. How many fish are in each tank?

Answers

8. divide 72 by 9 and you get 8

There are eight fish in each tank. Because 72 divided by 9 is 8.

Money that an individual spends is referred to as
A. Investment
B. Liquidity
C. Cash inflow
D. Cash outflow

Answers

Cash outflow I think.

Factor the expression over the complex numbers.

x2+25

Answers

Answer:(x+5i) (x-5i) is the right answer

Final answer:

The expression x^2 + 25 can be factored over the complex numbers as (x + 5i) and (x - 5i). This is achieved using the sum of squares formula a^2 + b^2 = (a + bi)(a - bi).

Explanation:

The expression you are tasked with factoring is x2 + 25.

This is a sum of squares expression and can be factored using the formula a2 + b2 = (a + bi)(a - bi), where 'i' represents the complex numbers.

So, x2 + 25 can be factored as (x + 5i)(x - 5i).

This is because the square root of 25 is 5, and 'i' represents the imaginary number.

So the factors of the expression x2 + 25 over the complex numbers are (x + 5i) and (x - 5i).

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