answers for number 21 and 24 questions

Answer: 9/2

Step-by-step explanation: Since the simplest form of the fraction 90/20 is 9/2, the simplest form of the ratio 90:20 is also 9:2. Please give brainliest.

The correct addition of two decimal points is 71.34

Finding the total of two or more decimal numbers is known as adding decimals. Even though adding decimals is comparable to adding whole numbers regularly, there are specific rules that must be followed.

According to the given information

We are given that

The given decimal digits are 8.84 and 62.5

The way Ander added the decimal values

 8.84

+62.5

150.9      

The mistake in his addition is that he did not put decimal below decimal according to the rule

So,

The correct Addition is

8.84 + 62.5 = 71.34

The correct addition of two decimal points is 71.34

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Positive Rational Numbers, Negative Rational Numbers, Whole Numbers, Fractions are the 4 types of rational numbers.

1. Positive Rational Numbers: These are numbers that are greater than zero, such as 1/2, 3/4, and 5/6.

2. Negative Rational Numbers: These are numbers that are less than zero, such as -1/2, -3/4, and -5/6.

3. Whole Numbers: These are numbers that are greater than or equal to zero, such as 0, 1, 2, 3, and so on.

4. Fractions: These are numbers that are represented as a ratio of two integers, such as 1/2, 3/4, and 5/6.

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Answer:

Jill paid 26.73$, and Jane paid 16.20$ with tax in total 42.93$

Step-by-step explanation:

[tex]24.75$ * 0.08$= 1.98$\\15$ * 0.08$= 1.2$\\24.75$ + 1.98$=26.73$\\15$ + 1.20$= 16.20$\\26.73$ + 16.2$= 42.93$[/tex]

Answer:

A: -139

Step-by-step explanation:

139 + (-139) = 0

Answer: -139

Answer:

It would be A. -139

Step-by-step explanation:

139 + -139 is the same thing as 139 - 139
A positive plus a negative is saying a positive minus a positive. so it is A

The total number of frogs in the reservoir are 160.

What is Reservoir?

An enlarged lake behind a dam is a reservoir. Such a dam could be a man-made structure created to hold freshwater or it could be a natural formation.

Given:

Elanor wants to estimate the number of frogs in a reservoir.

She catches 90 frogs from the reservoir and marks them with a non-harmful dye.

Elanor then returns the frogs to the reservoir.

The next day she catches another 80 frogs and 10 of these are marked with the dye.

So on the first day the total frogs are 90.

On second day total frogs are 80 but 10 of them are dye, so the remaining are 70.

Therefore, the total frogs are 90 + 70 = 160.

Hence, the total number of frogs in the reservoir are 160.

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Answer:could you get a better picure

Thank you :)

Answer:

4x+14

Step-by-step explanation:

Your welcome! Give me brainiest! :>

Answer:

  (a)  15 -18i

Step-by-step explanation:

You want the simplified form of the expression -2i(5- i) + (17- 8i).

For many purposes, the value i in a complex number can be treated in the same way a variable would be treated. When simplifying an expression involving i, any instances of i² can be replaced with the real value -1.

  -2i(5- i) + (17- 8i) = -10i +2i² +17 -8i

  = -2 +17 +(-10 -8)i

  = 15 -18i

__

Additional comment

Your scientific or graphing calculator can probably help you evaluate such expressions.

Point-slope form: y - 13= -3(x + 8)

Slope-intercept form: y = -3x - 11

Answer:

[tex]\sf a. \quad Scale\;factor=\dfrac{10}{9}[/tex]

b.    Enlargement.

Step-by-step explanation:

The original figure is called the "pre-image".

The new, transformed figure is called the "image" and is usually indicated by the addition of ' after the name.

Therefore:

To find the scale factor of dilation, divide the dimension of the image by the dimension of the pre-image.

[tex]\implies \sf Scale\;factor=\dfrac{CP'}{CP}=\dfrac{20}{18}=\dfrac{10}{9}[/tex]

As the image is larger than the pre-image (and the scale factor is larger than 1), the dilation is an enlargement.

Answer:

[tex]\frac{13}{16}[/tex]

Step-by-step explanation:

1 [tex]\frac{3}{13}[/tex] is the same as [tex]\frac{13}{13}[/tex] + [tex]\frac{3}{13}[/tex] = [tex]\frac{16}{13}[/tex]

The reciprocal is just turning the fraction upside down.

Answer:

256

Step-by-step explanation:

The Square-1 is a Cubic twisty puzzle.

It is similar to the 3x3 Rubik's cube, but due to the way the pieces are cut and designed can shapeshift. It is even governed by the WCA, and uniquely the only shapeshifting puzzle in the WCA.

It's probably the hardest WCA puzzle to learn how to solve due to the restrictions in its turning and its unique design.Square-1 became an official WCA event in 2007. It is a shape-shifting puzzle with a middle slice that you can use to interchange pieces.

X-Man Volt has long been the best square-1 on the market. However, Yu-Xin has rolled out a new budget square-1, which is fully magnetic.

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Answer:

They each brought $22 to the fair

Step-by-step explanation:

8+3=11

11*2=22

Answer=22

Answer:

A’ (5,2) B’ (2,1) and C’ (1,3)

Step-by-step explanation:

When we reflect a point (x,y) over x-axis, we get (x,-y)

A ( 2,5) becomes (2,-5)

B (1,2) becomes (1,-2)

C ( 3,1) becomes (3,-1)

Then we proceed to rotate 90 degrees counterclockwise about the origin

(x,y) becomes (-y,x)

(2,-5) becomes (5,2)

(1,-2) becomes (2,1)

(3,-1) becomes (1,3)

By replacing the value of x by 4 the answer to the given Algebraic Expression is 10

What is an Algebraic Expression?

The concept of algebraic expressions is to represent numbers using letters or alphabets without providing their real values. In mathematics, an algebraic expression is an expression composed of variables and constants as well as algebraic operations (addition, subtraction, etc.). Terms combine to form expressions.

Solution:

All we have to do to solve the following problem is to replace x by 4

3(4+4)(4+1)/(4+2)(4-2)

(3*8*5)/(6*2)

10

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The pairs of days and heights that could also be included in the table is given as follows:

The slope-intercept linear function that defines the plant's height after x days is given as follows:

y = mx + b.

The coefficients of the function are given as follows:

Then, considering the table given at the end of the answer, the equation that gives the height after x days is of:

y = 2x + 10.

The possible pairs are given at the beginning of the answer, for example, on day 9, the expected height is of:

y = 2(9) + 10 = 28 in.

The table is given by the image shown at the end of the answer.

The problem is incomplete, hence the pairs were calculated considering the table at the end of the answer. For a different table, you should follow the same procedure, identifying the equation and then testing the pairs.

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The temperature was 42°C this afternoon. If the temperature dropped 9°C, The temperature is now 33°C.

In order to calibrate thermometers, a variety of temperature scales with distinct reference points and thermometric materials are used.The Celsius scale (°C), formerly known as centigrade, with the unit symbol °C, is the most commonly used scale, followed by the Fahrenheit scale (°F) and the Kelvin scale (K), which is mostly used for scientific purposes. One of the seven base units in the International System of Units is the kelvin (SI).

42°C - 9°C = 33°C

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The equation to find the value of x is x² - x - 4 = 0

The dimension of a sand box can be represented as (x + 2) inches and (x + 1) inches. The value of the area in square inches of the sandbox is equal to the value of the perimeter of the sandbox in inches.

Therefore, the equation that can be used to find the value of x can be express as follows:

Hence,

area of the sandbox = (x + 2)(x + 1)

area of the sandbox = x² + x + 2x + 2

area of the sandbox = x² + 3x + 2

Perimeter of the sandbox = 2(x + 2 + x + 1)

Perimeter of the sandbox =2(2x + 3)

Perimeter of the sandbox = 4x + 6

Therefore,

x² + 3x + 2 =  4x + 6

x² + 3x - 4x + 2 - 6 = 0

Hence, the equation is  x² - x - 4 = 0

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Answer:

( -4 , 1 )

Step-by-step explanation:

Answer: -4

(Hope I'm correct :D )

Step-by-step explanation:

Easy, let's start with what we know to find the slope. To find the slope you do:

(y2-y1)/(x2-x1)

For this equation then, we do:

(-2 - 2)/ (-5 - (-6)) Which simplifies to:

-4/1

= -4

So the slope is -4.

Her height is 48 inches

The percentage is calculated by dividing the required value by the total value and multiplying by 100.

Example:

Required percentage value = a

total value = b

Percentage = a/b x 100

Example:

50% = 50/100 = 1/2

25% = 25/100 = 1/4

20% = 20/100 = 1/5

10% = 10/100 = 1/10

We have,

The distance jump = 13.2 inches

The percentage of the distance jump = 27.5% of her height.

This means,

Height = x

x = 100%

Now,

13.2 inches = 27.5%

Multiply 100/27.5 on both sides.

100/27.5 x 13.2 inches = 100%

48 inches - 100%

Thus,

The height is 48 inches.

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The probability of getting a red ball on the first draw and a white ball on the second is 0.3.

Total number of balls = 10

Now we have to pick: 4 red balls or 3 black balls or 3 white balls.

Case-1:

In this case we pick 4 red balls.

Now, probability for picking one red ball is 3/10.  Now, the 2nd ball is drawn which is also red, probability for picking 2nd red ball is 2/19. probability for picking two red balls is

P(r) = (3/10) (2/9)

Case-2:

In this case we pick 3 white balls

Probability for picking 3 white balls

P(w) = (3/10) × (4/9)

Case-3:

probability for picking 03 black balls:

P(b) = (03/10) (02/9)

Therefore, probability for picking 2 same color balls:

= (3/10) (2/9) +(03/10) × (04/9) +(03/10) (02/9)

= 0.3

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There are an infinite number of solutions to the system of equations 2x + 5y = - 2 and 4x - 10y = 4.

The intersection locations of all the aforementioned equations can be found using graphic solutions to a system of equations.

Only when the equations have an intersection point can a system of two or more equations be solved.

According to the given information

A set of equations including

4x - 10y = 4 and 2x + 5y = - 2... (ii).

Now, when we multiply equation(i) by 2, we get

- 4x + 10y = - 4. (iii).

Adding (ii) and (iii) now gives us,

0x + 0y = 0.

Since 0 = 0, these coincident lines have an infinite number of solutions.

There are an infinite number of solutions to the system of equations 2x + 5y = - 2 and 4x - 10y = 4.

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Dale and his dog walk for 5 miles.

What is distance?

Distance is a measurement of how far apart two objects or points are, either numerically or occasionally qualitatively. Distance can refer to a physical length in physics or to an estimate based on other factors in common usage.

Given:

Dale and his dog walked for 1.25 hours at a speed of 4 miles per hour.

Since,

Distance = Speed x time

Here, speed = 4 miles per hour and

time is 1.25 hours

So,

Distance = 4 x 1.25

Distance = 5 miles

Hence, Dale and his dog walk for 5 miles.

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Add the scale factor to the x- and y-coordinates of a point on a coordinate plane with the center of dilatation at the origin.

Given,

Dilation;

Resizing an object is accomplished through a change called dilation. The objects can be enlarged or shrunk via dilation. A shape identical to the source image is created by this transformation. The size of the form does, however, differ.

We have to dilate a figure with a center of dilation;

Dilations centered at the origin;

On the coordinate plane, figures can be enlarged. The centre of dilatation is frequently used to be the origin. The points in the picture can be found by multiplying the coordinates of the preimage's points by the scale factor when distorting a figure that is centered at the origin.

That is,

On a coordinate plane with the center of dilatation at the origin, multiply the point's x and y coordinates by the scale factor.

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Answer: 8

Step-by-step explanation:

128 divided by 16 = 8 baseball cards on each page

8 Baseball card if the page takes the same number of baseball cards

Step-by-step explanation:

If the album as 16pages, and there are 128 baseball cards to share in each pages "equally", then it's going to be 128/16 which equals 8 in each pages

The probability of winning is 0.01 is -2  is the expected profit of this game.

What is probability?

Expected profit of the game =expected value received from this game- cost to play the game

=100*0.01-3

= -2

Hence, the probability of winning is 0.01 is -2 is the expected profit of this game.

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A 20 year old has height below 3.7 feet and above 7.9 feet then 20 year old be considered abnormal.

The average height means that the given population determined by the interaction between the environment in which it lives and the resources it commands.

Abnormal means diffrent from what is normal or usual, in a way that worries you or that is unplesant.

We have given that average height is 5.8 feet.

And abnormal height a 20 year old must be 2.1 feet below average height or 2.1 feet above average height.

Therefore 5.8 - 2.1 = 3.7 feet

                 5.8 + 2.1 = 7.9 feet

Hence height below 3.7 feet abd above 7.9 feet is considered to be abnormal.

That means [-∞ , 3.7] and [7.9,∞] is considered to be abnormal height for 20 year old man.

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