9. Which of the following vary inversely with each other?
(a) speed and distance covered.
(b) distance covered and taxi fare.
(c) distance travelled and time taken.
(d) speed and time taken.

8th class maths . please explain your answer ​

(a) The equation to find x is :  (6x)°  + (x-8)°  = 90°

(b) The degree measure of the  complementary angles, m∠1 = 84° and m∠2 = 6°

Complementary angles are two angles whose sum is 90 degree.

Given are two complementary angles ∠1 and ∠2 whose measures are given m∠1 = (6x)° and m∠2 =(x-8)°

From the given figure we can see that sum of  ∠1 and ∠2 is 90°, which means they are complementary.

m∠1 + m∠2 = 90°

And  (6x)°  + (x-8)°  = 90°

Or      6x +x-8 = 90

7x = 90+8

7x= 98

x= 98/7 =14

Then m∠1 = (6x)° = (6*14)° = 84° and m∠2 = (x-8)° = (14-8)° = 6°

Therefore, The equation to find x is (6x)°  + (x-8)°  = 90° and measure of the  complementary angles, m∠1 = 84° and m∠2 = 6°

Also, Learn more about complementary angles from :

https://brainly.com/question/5708372

#SPJ1

Answer:

48x^2 - 48x + 38

Step-by-step explanation:

To get the composite function first understand the process of which a function inside another operates.

First solve one step at a time by trying to evaluate the inside before evaluating the outside using substitution.

For instance, h(g(f(x))) is the h function of g function of f.

Since f(x) is the inner component of the composite function, replace the x of g with the value of f(x).

Such that g(x) = 3x^2 + 5 → 3(f(x))^2 + 5 →

3(2x - 1)^2 + 5 → 3(2x - 1)(2x - 1) + 5 [foil] → 3(4x^2 - 4x + 1) + 5 → 12x^2 - 12x + 3 + 5 →

12x^2 - 12x + 8

Thus g(f(x)) = 3(f(x))^2 + 5 = 12x^2 - 12x + 8.

Finally to compute h(g(f(x))), using the process from the first composite function, same can be applied here:

Since h(x) = 4x + 6 →

h(g(f(x))) =

h(12x^2 - 12x + 8) =

4(12x^2 - 12x + 8) + 6 [distribute] →

48x^2 - 48x + 32 + 6 [combine like terms] →

48x^2 - 48x + 38

Answer:

(x,y,z) = (1,1,4)

Step-by-step explanation:

[tex]A: -2x + 3y - z = -2\\B: 3x+y=4\\C: -2y+2z=4\\[/tex]

[tex]Solve\ B\ for\ y: y = 4-3x\\Solve\ C\ for\ z: 2z=4+2y\ \ z=2+y\\Substitute\ B_y\ into\ C_z: z = 2+4-3x\ \ z=6-3x\\Substitute\ B_{y\ in\ terms\ of\ x}\ and C_{z\ in\ terms\ of\ x} into A: \\-2x + 3(4-3x) - (6-3x) = -2\\Distribute: -2x + 12-9x-6+3x=-2\\Combine\ Like\ Terms\ on\ either\ side: -2x-9x+3x=-2-12+6\\Factor\ out\ x\ and\ perform\ arithmetic\ on\ right: x(-2-9+3) = -8\\Perform\ Arithmetic: x(-8)=-8\\Divide:x=1[/tex]

[tex]Plug\ x\ into\ B_y: y=4-3(1)\\Perform\ Arithmetic: y=1\\Plug\ y\ into\ C_z: z=2+2(1)\\Perform\ Arithmetic: z=4[/tex]

Answer:

0.10x + 0.13y = 10780

x + y = 100000

x = 74000 --------------10%

y = 26000 --------------13% (more risky)

A quotient is an answer in the division. The divisor (denominator) and the quotient are the factors. The dividend (numerator) is the amount being divided — it doesn’t matter whether the dividend is larger or smaller than the divisor.

In elementary school, we refer to this process only in terms of fractions, so many people don’t realize that fractions are just division. If your fraction is proper, you will get a decimal number or simplified equivalent fraction. If the numerator (multiple) is the larger number, then the quotient will represent the other factor after dividing.

For example, in the equation x + 5 = 10, x is the unknown variable, and you want to find some number, which when added to 5 would result in 10.

Quotients are answers to a division problem.

For example, the quotient of 8÷2 would be 4.

For more information on quotient click on the link below:

https://brainly.com/question/11418015

#SPJ4

Answer: -32+5√6

Step-by-step explanation:

(3√3 - 5√2) (2√3 + 5√2)=

(3√3 * 2√3) + (3√3 * 5√2) - (5√2 * 2√3) - (5√2 * 5√2) =

(3*2*√3*√3) + (3*5*√3*√2) - (5*2*√2*√3) - (5*5*√2*√2)=

6*3 + 15*√(3*2) - 10*√(2*3) - 25*2=

18+15√6-10√6-50=

18-50+(15-10)*√6=-32+5√6

Answer:

Fruit Juice = 24 litres

Lemonade = 16 litres

Step-by-step explanation:

So, the ratio: [tex]3:2[/tex] really just means: "for every every 3 litres of fruit punch, there is 2 litres of lemonade.

Or in other words, every 3 litres of fruit punch, the entire mixture of both fruit punch and lemonade will be 5 litres, since there is 3 litres and 2 litres.

So dividing the 40 litres, by this 5 litres, we get 8. So we know there will be "8" of 3 litres of fruit punch, and "8" of 2 litres of lemonade.

Thus there will be 24 litres of fruit punch, and 16 litres of lemonade.

Answer:

Step-by-step explanation:

A common monomial factor is a single-term polynomial that divides into each term of a given polynomial evenly.

The yard is 6 meters wide by use of Pythagoras crossing the diagonal to create a rectangular triangle.

The formula for the Pythagoras theorem is written as c2 = a2 + b2, where c is the hypotenuse of the right triangle and a and b are its other two legs. As a result, to generate a Pythagoras triangle, the Pythagoras equation can be used to any triangle with one angle that is precisely 90 degrees.

d² = l² + w²

d = 10

l = 8

Solving for w, the width is

w² = d² - l²

So, we can replace the values with d = 10 and l = 8, to get

w² = 10² - 8²

w² = 100 - 64

w² = 36

w = 6

Hence the width of the yard is 6.

To know more about the Pythagoras theorem, visit :

https://brainly.com/question/343682

#SPJ4

The zeroes of the function f(x) = x⁴ - 3x³ - 4x² are x = -1 , 0 , 4.

The zeroes of a function are the x - intercepts (the points where the graph cuts the x - axis) of the graph of the function f(x).

Given is a function f(x) as → f(x) = x⁴ - 3x³ - 4x²

In order to find the zeroes of the function → f(x) = x⁴ - 3x³ - 4x², we will plot the graph of the function. The graph is attached at the last. We can see that the graph cuts the x - axis at three coordinates → (- 1, 0) , (0, 0) , (4, 0). The x - intercepts will be → -1, 0, 4.

Therefore, the zeroes of the function f(x) = x⁴ - 3x³ - 4x² are x = -1 , 0 , 4.

To solve more questions on zeroes of function, visit the link below-

https://brainly.com/question/14012752

#SPJ1

The number of fiction books in the library are 324, as found by unitary method.

A single unit's value can be determined from the values of multiple units, and multiple units' values can be determined from the values of single units using the unitary method.

Given: There are 5 non-fiction books for every 9 fiction books. Total 130 non-fiction books are there in the library.

To find: number of fiction books.

Finding: By unitary method, For every 5 non-fiction books, there are 9 fiction books.

For every 1 non-fiction book, there are 9/5 fiction books.

For every 130 non-fiction books, there are 9/5 × 130 = 324 fiction books.

Hence, The number of fiction books in the library are 324, as found by unitary method.

To learn more about unitary method, refer to the link: https://brainly.com/question/24587372

#SPJ9

(COMPLETE QUESTION:in a small library there are 5 nonfiction books for every 9 fiction book there are 130 nonfiction book. How many fiction books are there in the library?)

Hi there!

From the given conditions:

[tex]1→1 ⟹1 \times 1 = 1[/tex]

[tex]5→7⟹ 5 \times 7 = 35[/tex]

[tex]8→11 ⟹8 \times 11 = 88[/tex]

[tex]9→4 ⟹9 \times 4 = 36[/tex]

[tex]10 →2 ⟹10 \times 2 = 20[/tex]

Sum = 180, no. of customers = 25

[tex]average = \frac{sum}{no.ofcustomers} [/tex]

[tex] ⟹ \frac{180}{25} = 7.2[/tex]

Therefore, on average, the satisfaction rating of the landscape company was 7.2

The Height of the frame having area of 560cm² is 50cm.

By splitting a rectangle into two equal-sized right triangles, the formula for calculating the area of a rectangle may be obtained. For instance, a diagonal is drawn from vertex A to vertex C in the rectangle ABCD that is supplied.

The rectangle is split into two identical right-angled triangles by the diagonal AC.

(ABCD) Area = b × h

Given,

The area of the frame = 560cm²

Width of the frame = 11 1/5

Length = ?

Area of the rectangle = Length × Breadth

560 = 11 1/5 × L

⇒ L = 560 × 5/56

⇒ L = 50cm

The frame is 50cm tall.

To learn more about area of rectangle from given link

https://brainly.com/question/25292087

#SPJ9

Correct question -

Claire is making a frame to display a drawing she made. The frame is 11 1/5 cm wide. The frame has a rectangular shape and an area of 560cm². How tall is the frame?

Answer:

68 acres per day

Step-by-step explanation:

34 acres per day × 2 days = x

34 × 2 = x

x = 68 acres per day

Hope this helps!

Answer:

68 acres

Step-by-step explanation:

34 acres= 1 day

x=2 days

x=68 acres

they can plant 68 in 2 days

Answer:

n=-2/3

Step-by-step explanation:

2/3n + 3/2n = -13/4

Make 2/3n and 3/2n into 4/6n and 9/6n so you can add them together.

13/6n = -13/4

Divide both sides by 13/6

n=-2/3

^ i hope thats what you were asking for :)

The expression is [tex](x - \sqrt{6} )^{n}[/tex] , n = 1, 2, 3....

Polynomial expression:

A polynomial expression is an expression consisting of indeterminates and coefficients, that involves only the operations of addition, subtraction, multiplication, and positive-integer powers of variables.

It is given that

x = √6

x - √6 = 0

[tex](x - \sqrt{6} )^{n}[/tex] where n = 1,2,3.....

Therefore the expression of the polynomial given roots is [tex](x - \sqrt{6} )^{n}[/tex] .

To know more about the polynomial expression refer to the link given below:

https://brainly.com/question/21865398

#SPJ9

The product should have a 1 significant digit.

When multiplying Scientific notations, the significant figure of the final result must be approximated to the scientific notation that has the least decimal place.

From the question given, if we 4.5160 x 10^3, 2.09 x 107, and 5.8 x 10^3 are multiplied, the product should have 1 significant digits since the least decimal value that occur in question is 1dp

Hence the product should have a 1 significant digit.

Learn more on product of decimals here: https://brainly.com/question/28416295

#SPJ1

The range of the data provided in the boxplot given the minimum number and the maximum number is 2.

A box plot is used to study the distribution and level of a set of scores. The box plot consists of two lines known as the whiskers and a box. The left whisker represents the lowest number in the dataset. The right whisker represents the highest number in the dataset. The difference between these numbers is the range.

The box can be used to determine the first quartile, median and the third quartile. These values can be determined using the lines on the box.

The range of a data set is the difference between the highest number and the lowest number. Range is used to measure the variance of a dataset.

Range = highest number - lowest number

7.5 - 5.5 = 2

To learn more about box plots, please check: https://brainly.com/question/27215146

#SPJ1

Given the total spent on buying favors = 2.03 $

Let the number of favors she bought = x

let the amount of each favor = y

She bought favors for less than 10 be

x < 10

The amount she spent can be written as  

x * y = 2.03

To learn more about simultaneous equations, please check:

https://brainly.com/question/20499587

#SPJ9

Answer: 3.5

Step-by-step explanation:

If your trying to solve for X the answer would be 3.5 because you calculate 2 to the power of 1 and get 2 which then by now your equation should look along the lines of 3×2X+1−4^1 X=8

Calculate 4 to the power of 1 and get 4 then you Subtract 1 from both sides.

and then Subtract 1 from 8 to get 7. Combine all terms containing X which would make the equation come down to a standard form which then means you would have to divide both sides by 2, by dividing by 2 undoes the multiplication by 2. You should get 7/2 which then = 3 and 1/2 converted into 3.5

Using a linear function, it is found that Tamara will need to order a new bag after 46 days.

A linear function is modeled according to the following rule:

y = mx + b

In which:

The slope and the intercept in the context of this problem are given as follows:

Hence the weight of the bag after d days is given by:

W(d) = 20 - 0.4d.

He needs to order a new bag when W(d) = 1.6, hence:

1.6 = 20 - 0.4d.

0.4d = 18.4

d = 18.4/0.4

d = 46 days.

Hence she needs to order the new bag in 46 days.

More can be learned about linear functions at https://brainly.com/question/24808124

#SPJ1

The mean time that a certain model of light bulb will last is ​hours is 900 hours and the required percentage of bulbs is 2.5%

Here,

x is the time that a certain bulb will last.

(in houses.

μ=900 hours;

σ=1200 hours.

The standardized value for a light bulbs lasts 1100 hours, is,

z=x-μ/σ

z=1100-900/100=2

We know, for a bell-shaped distance, Approximately,

68% of the data falls within M-uσ;

By rule (ii), here,

95% of the data falls within (μ-2σ,u+2σ)

(900-2x100,900+2x100)

(700,1100)

So (100-95=5%) falls outside of (700,1100)

Since, the distance is symmetric (i.e. bell-shaped); we find the percentage of bulbs that is expected lo lase longer than 1100 hours, is

5/2% =2.5%

To learn more about standard deviation visit:

brainly.com/question/14747159

#SPJ4

the range of possible profits, in dollars, is given by the inequality:

-13 < y < 86

We know that the linear equation:

y = 11*x - 200

Shows the profit for selling x pokemon cards.

We know that he sells more than 17 and less than 26, then:

17 < x < 26

Then the minimum profit is:

y = 11*17 - 200 = -13

The maximum profit is:

y = 11*26 - 200 = 86

We conclude that the range of possible profits, in dollars, is:

-13 < y < 86

If you want to learn more about inequalities:

https://brainly.com/question/24372553

#SPJ1

Check the picture below.

Answer:

g

Step-by-step explanation:

The chicken will weigh 3 pounds when it is 10,000 miles from the earth's center.

There are two types of proportions.

1) Direct Proportion - shows the direct relationship between two quantities. It can be represented by the equation y = kx. As one quantity increases, the other quantity also increase.

2) Inverse Proportion - describes the indirect relationship between two quantities.  It can be represented by the equation y = k/x. As one quantity increases, the other quantity decreases.

According to the problem, a body’s weight varies inversely with the square of its distance from the center of the earth.

y = k/x

let y = a body's weight

x = square of its distance from the center of the earth

Solving for the proportionality constant, k.

y = k/x

12 = k / (5000^2)

k = 12 x 25, 000, 000

k = 300, 000, 000

The equation for the relationship in the problem can now be represented by:

y = 300,000,000/x

where

y = a body's weight

x = square of its distance from the center of the earth

Evaluating the new equation where x = square of 10,000:

y = 300,000,000/x

y = 300,000,00/(100,000,000)

y = 3

Hence, the chicken will weigh 3 pounds when it is 10,000 miles from the earth's center.

To know more about proportions: https://brainly.com/question/1266676

#SPJ4

Answer:

46 miles

Step-by-step explanation:

First, set up an equation:

(48 + 58 + 68 + 50 + x) ÷ 5 = 54

Add the miles in the parentheses:

(48 + 58 + 68 + 50 + x) ÷ 5 = 54

48 + 58 + 68 + 50 = 224

(224 + x) ÷ 5 = 54

Multiply by 5 on each side:

[(224 + x) ÷ 5] × 5 = (54) × 5

(224 + x) = 270

Subtract 224 on each side to isolate x:

(224 + x) - 224 = (270) - 224

x = 46 miles

Hope this helps! I'd appreciate brainliest but if not that's fine!

[tex]\stackrel{3x}{R\rule[0.35em]{10em}{0.25pt}} A\stackrel{5x-12}{\rule[0.35em]{10em}{0.25pt}T} \\\\\\ 3x~~ = ~~5x-12\implies 3x+12=5x\implies 12=2x\implies \cfrac{12}{2}=x\implies \boxed{6=x} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{\LARGE RT}}{3(6)~~ + ~~5(6)-12\implies 18+18\implies \text{\LARGE 36}}[/tex]

A mean is the average of set of values such that the values hold different levels of importance.

Mean can be defined as the mathematical average of a group or set of numbers.

It is also the most common value in a collection of numbers.

The formula for determining the mean of a group of data is;

Mean = sum of terms/number of terms

An important and distinct property of the mean is the inclusion of every value in a given set of data of the calculation.

Also, both discrete and continuous data are used in determining the mean.

Thus, a mean is the average of set of values such that the values hold different levels of importance.

Learn more about mean here:

https://brainly.com/question/20118982

#SPJ1