Anna said that the product of 78⋅112=7278·112=72.


How can you tell that her answer is wrong?

Answers

Answer 1

Answer:

The easiest way I can think of to show someone who is not very mathematically inclined that the calculation is wrong (other than using a scientific calculator) is this:

Explain that one half contains four eighths - you can visualize this very simply with a pie chart.

Then tell Anna that mathematically speaking this translates to the equation:

1/2 = 4 * 1/8

Now, if ONE half is equal to four times ONE eighths, then SEVEN halves is equal to four times SEVEN eighths - basically, you just multiply both sides by 7:

7/2 = 4 * 7/8

Now, compare this to the equation proposed by Anna:

7/2 = 1½ * 7/8

I guess, at this point it will be easy to convince Anna that 1½ is not 4, and therefore her equation is faulty.

-----

Alternatively, if she's sound with fractions you could also tell her that to get from 7/8 to 7/2 you will need a factor which only affects the denominator as the numerator stay the same. The factor that turns 8 into 2 is 1/4 but since this takes place in the denominator we need the reciprocal to turn 1/8 into 1/2 - and the reciprocal of 1/4 is of course 4. At which point we've arrived at the same place of argumentation as before (which is that 4 ≠ 1½).

Step-by-step explanation:

hope this helps        :)


Related Questions

Why is the surface area of a triangular prism measured in square units rather than in cubic units? Surface area measures the area of the faces. Area is a -dimensional measurement, so it is measured in square units.

Answers

Answer:

Step-by-step explanation:

Area of a given figure is a 2 dimensional measurement which describes the amount of space occupied by the figure, while volume of the figure describes its capacity in a 3 dimensional measurement.

The surface area of a triangular prism is the sum of the areas of all its surfaces. Since the surface area considers the areas of the figure not volume, therefore the surface area of the triangular prism is measured in square units not cubic units.

The y-intercept of y=2.5^x-6

Answers

Answer:

-6

Step-by-step explanation:

-6 is the y-intercept :)

The length of a rectangle is 45 inches and the width is 8 inches. A similar rectangle has a width of 24 inches what is the perimeter of the second rectangle? Show your work

Answers

Answer: The answer is 318

Step-by-step explanation:

find the value of given expression

[tex] \sqrt{564 \times 564} [/tex]


Answers

Answer:

√(564×564)=√564²=±564

Answer:

[tex]±564.[/tex]

Step-by-step explanation:

[tex] \sqrt{564 \times 564} [/tex]

[tex] \sqrt{ {564}^{2} } [/tex]

[tex]±564.[/tex]

Is the situation continuous or discrete?

Answers

Answer:

continuous

Step-by-step explanation:

Continuous because it keeps going and doesn’t stop.

Here is the original
23/67

Answers

Answer:

0.343283582

HOPE IT HELPS

Bob challenges Alice to a swimming race from one end of a 10-meter pool tothe other. Bob is so confident he will win that he lets Alice use the starting blockbecause diving in from there will give her a lead. He will start in the pool at the wall.Alice accepts the offer. At time t=0 seconds, Alice hits the water 2 meters out fromthe edge of the pool at a constant speed of 1 meter per second, which she maintainsthroughout the race. Meanwhile, at t=0, Bob starts off from rest at the pool walland is speeding up. Bob’s distance from the wall at any given time, t, is given byBt()=0.25t2, where Bt() measures the distance from the starting point at the poolwall. Will Bob be able to beat Alice to the opposite end of the pool? Is it possible forBob to win, and if so, how long would the pool need to be for him to win?

Answers

Answer and work Answer and work Answer and work

The area of a circle is 30.85cm2. Find the length of the radius rounded to 2 DP

Answers

Answer: 3.13

Step-by-step explanation:

if m=2 , find the value of 5-m

Answers

Answer:

5 - 2 = 3

Step-by-step explanation:

Replace m with 2 since m=2

Answer:

3

Step-by-step explanation:

If m=2, then 5 - m(2) is 3, because 5 - 2 is 3.

Mark is making a model tent for his project,
the area of the base is 56 square inches.
Which of the following is the best ESTIMATE
for the volume of the tent? A-756 inches, B-
745 inches, C-1500 inches, D-800 inches?

Answers

Answer:

756 inches

Step-by-step explanation:

1. you have to multiply 27 by 56 and there's your answer.

The volume of the rectangular prism is ___ cubic units.

Answers

Answer:

144 cube units

Step-by-step explanation:

volume = width*height*length

V=12*3*4

V=144 cube units

Answer:

This is your answer. If I'm right so,

Please mark me as brainliest. thanks!!!

In the following equation, what number represents the y-intercept?

y = 2x – 10

1) 0

2) -1

3) 2

4) 10

Answers

Answer:

4) 10

Step-by-step explanation:

The number with x is slope and the other number is y-intercept so it's 10

Work out the size of angle x.
38°
х
101°

Answers

The size of the angle 'x' is 117°

The external angle of a triangle:

An external angle of a triangle is an angle formed by extending one side of the triangle and intersecting with the extension of another side.

In a triangle, the measure of an external angle is equal to the sum of the measures of the two opposite interior angles.

Here we have  a triangle

Let the ABC be the triangle as given in the picture

=> ∠A = 38°  

From the baseline BC

=> Measure of B = 180° - 101° = 79°

As we know

In a triangle, the measure of an external angle is equal to the sum of the two opposite interior angles

=> x = ∠A + ∠C

=> x = 38° + 79°

=> x = 117°  

Therefore,

The size of the angle 'x' is 117°

Therefore,

Learn more about Triangles at

https://brainly.com/question/9934544

#SPJ1

PLEASE EMERGENCY THAN YOU

Answers

Answer:

135°

Step-by-step explanation:

This is a cyclic quadrilateral.

It has a property of opposite angles being supplementary.

A and C are supplementary angles:

3x + 6 + x + 2 = 1804x + 8 = 1804x = 172x = 43

m∠A = 3x + 6 = 3*43+ 6 = 135°

Answer:

<A=135°

Step-by-step explanation:

3x+6+x+2=180

sum of two opposite angle of the cyclic quadrilateral is 180

4x=180-8

x=172/4=43°

<A=3×43+6=135° is your answer

what is the answer to this

Answers

Answer:

IDEK

Step-by-step explanation:

Answer: i d k

Step-by-step explanation:

Vanessa bought some cupcakes and brownies at the school bake sale.

She bought 25 items in total and spent $40.

Each cupcake costs $2 and each brownie costs $3.

Answers

Answer:

6 brownies and 2 cupcakes.

Step-by-step explanation:

Determine the equation of the line based on the graph.
(write in slope-intercept form)
Submit

Answers

Answer:

5/2

Step-by-step explanation:

rise over run | you rise up 5 everytime and you go right 2 everytime

(10-x)(3x -9)=0

NEED HELP ASAP

Answers

Answer:

Step-by-step explanation:

Since the expressions are multiplied, for the product to equal zero, one term or another has to equal 0 because 0 times anything is zero.

(10-x)(3x-9)=0 when

10-x=0, x=10

3x-9=0, x=9/3=3

So there are two solutions when x=3 and x=10

find the value of given expression

[tex] \sqrt{65 \times 65} [/tex]

Answers

Answer:

[tex]\huge \colorbox{blue}{65}[/tex]

Step-by-step explanation:

to understand thisyou need to know about:PEMDAStips and formulas:

order of PEMDAS

parenthesesexponentmultiplication ordivisionaddition orsubstractionleft to rightlet's solve:

simplify multiplication:

[tex] \displaystyle \: \sqrt{ {65}^{2} } [/tex]

use [tex]\sqrt{x^m}=x^{\frac{1}{2}\times m}[/tex] to simplify:

[tex] \displaystyle \: = {65}^{2 \times \frac{1}{2} } \\ = {65}^{ \cancel{ \: 2 }\times \frac{1}{ \cancel{ \: 2}} } \\ = {65}^{1} [/tex]

as we know x¹=x

therefore our final answer is

65

Answer:

[tex]65[/tex]

[tex] \sqrt{65 \times 65} \\ = 65[/tex]

The number of days, d, required to complete a job varies inversely as the number of workers, w, on the job.
If it takes 9 days for 8 workers to complete a job, then how many workers would it take to do the job in 18 days?

Answers

Answer:

4

Step-by-step explanation:

this one is an easy relationship- if you have double the time (18 vs9), then you need half the workers (8/2)

The perimeter of a square is 100 cm. How long is one diagonal?​

Answers

Since the 4 sides of the square are equal, divide the perimeter by 4 to get one side.

100/4 = 25 cm

i need help quickly guys

Answers

Answer:

5

Step-by-step explanation:

Answer:

5

Step-by-step explanation:

Pythagorean Formula:

a² + b² = c²

Given:

a = 3

b = 4

Work:

a² + b² = c²

3² + 4² = c²

9 + 16 = c²

c² = 25

[tex]\sqrt{c^2} =\sqrt{25}[/tex]

c = 5

Un sure on this if someone could answer would be great !

Answers

Answer:

x= 5/2 x= (±sqrt13)/2

Step-by-step explanation:

Rick bought a car for $17,500. Each year, the car's value decreases by 20%. At this rate, what can Rick expect the value of his car to be in 6 years? *
$1.12
$15,502.24
$4,587.52
$17,380.00

Answers

Answer:

His car would be worth $15,502.24

Step-by-step explanation:

20% of 17,500 is 350. 350 x 6 = 2,100. 17,500 - 2,100 = 15,400. But that is not an answer choice so be go to  the closest number which is $15,502.24

24. BLOCKS Building blocks are in the shape of a cube. The dimensions of the building blocks are based on the length of the packaging box, which is defined as x centimeters, where x is the length of the packaging box. What is the volume of a building block in terms of x?

Answers

Answer:

Step-by-step explanation:

Given that length of packaging box = length of block = x

The volume of a box is given as : a³

Where a is the side length ;

In this scenario, x = a

Hence, volume of Block = x³

Answer:

Step-by-step explanation:

11728x6

 cm3

Find the area plz plz

Answers

Answer:

57.475 ft2

Step-by-step explanation:

12.1x9.5= 114.95

114.95/2= 57.475

Answer:

[tex]\Huge\boxed{57.475 ft^2}[/tex]

Step-by-step explanation:

Hello there!

The following figure shown is a triangle

The area of a triangle can be calculated using this formula

[tex]A=\frac{bh}{2}[/tex] where b = base and h =height

The height of the triangle is 12.1 ft and the base length is 9.5ft

Knowing this information all we have to do is plug in the values into the formula

[tex]A=\frac{12.1*9.5}{2} \\12.1*9.5=114.95\\\frac{114.95}{2} =57.475\\A=57.475[/tex]

So we can conclude that the area of the triangle is 57.475 square feet

Please help I don’t understand

Answers

Answer:

QS is a triangle. Because QS are connected and split down the middle which made a triangle.

Step-by-step explanation:

Determine which is the graph of the given function.
-0.57+ 5 if x <1
=
-0.5(x + 5) if x 1

Answers

The answer is b hope it helps

The sum of two numbers is 8. Two times the larger number plus four times the smaller number is 8. Find the numbers.

Answers

Answer: 12 and -4

Step-by-step explanation:

Assume the larger number is x and the smaller one is y.

In that case the relevant simultaneous equations are:

x + y = 8

2x + 4y = 8

Use substitution to find relative value of y:

x + y = 8

y = 8 - x

Use to solve equation:

2x + 4y = 8

2x + 4(8 - x) = 8

2x + 32 - 4x = 8

2x  - 4x= 8 - 32

-2x = -24

x = -24 / -2

x = 12

y = 8 - x

= 8 - 12

= -4

find the value of x in the triangle shown below

x =____





help besties, i’m not smart

Answers

Answer:

x = 96

Step-by-step explanation:

x = 180 - (34 + 50)

x = 180 - 84

x = 96

You are smart, remember that! You just have a little trouble with this problem, that's all!

Hope that helps!

-Sabrina

The answer to x is 96
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