Mathematics High School

Em uma enorme ampulheta, foram colocadas 40 kg de areia. Sabe-se que a areia escoa lenta e uniformemente à razão de 500g por dia e que 2/5 da areia inicial já escoaram. Quantos dias faltam para a areia escoar totalmente?

Answers

Answer 1

Answer:

48 dias

Step-by-step explanation:

1000 gramas = 1 kg

A quantidade inicial de areia = 40kg

1 kg = 1000g

40kg = x

Multiplicação cruzada

1 kg × x = 40 kg × 1000g

x = 40 kg × 1000g / 1 kg.

x = 40,000 gramas

Somos informados de que 2/5 se esgotou.

Quantidade que foi drenada =

40,000 × 2/5

= 16,000 gramas foram drenados

Quantidade restante = 40,000 gramas - 16,000 gramas

= 24,000 gramas

A areia escoa a 500g por dia, portanto,

500g = 1 dia

24,000g = x

Multiplicação cruzada

500g × x = 24, 000 × 1

x = 24,000 g × 1 dia / 500

x = 48 dias

Restariam 48 dias para que a areia restante vazasse.

Related Questions

please answer correctly

2 + 3( 4x + 5) = -53

Answers

Answer:

x=-35/6

Step-by-step explanation:

2 + 3( 4x + 5) = -53

subtract 2 from both sides= 3(4x+5)=-55

divide both sides by 3 = 4x+5=-55/3

subtract both sides by 5 = 4x=-70/3

divide both sides by 4 = x=-35/6

x=-35/6 is your final answer

Answer:

Hope this helps :)

Step-by-step explanation:

Isolate the variable by dividing each side by factors that don't contain the variable.

Exact Form:

x=−35/6

Decimal Form:

x=−5.8¯3 (Repeating)

Mixed Number Form:

x=−5 5/6

factorsie x squared + 5x-14

Answers

Answer:

(x+7)(x-2)

Step-by-step explanation:

=x^2+5x-14

=x^2+(7-2)x-14

=x^2+7x-2x-14

=x(x+7)-2(x+7)

=(x+7)(x-2)

Answer:  (x+7)(x-2)

We're looking for two numbers that multiply to -14 and also add to 5. Through trial and error, you should find those numbers are 7 and -2.

You can use the FOIL rule to confirm that (x+7)(x-2) expands out to x^2+5x-14

(x+7)(x-2) = x^2-2x+7x-14 = x^2+5x-14

-(x-3)-2=2x
will need help ASAP

Answers

Answer:

1/3 = x

Step-by-step explanation:

plz just use. okay

1/3 or 0.3

identify the TWO sets of ordered pairs that represent a function
A).(1,-1),(-2,-7),(0,1),(-1,-1)
B).(1,-3),(-2,-8),(0,-1),(1,-2)
C).(2,-3),(-3,6),(-2,-2),(2,3)
D).(-3,2),(1,6),(2,2),(1,3)
E).(-5,2),(2,6),(3,2),(4,-5)

Answers

Answer:

A and E

Step-by-step explanation:

(1, −1), (−2, −7), (0, 1), (−1, −1) and (−5, 2), (2, 6), (3, 2), (4, −5) are functions because each x value corresponds to exactly one y value. a function must have only one output value for each input value.

The length of a rectangle is 4 inches greater than the width. The perimeter of the rectangle is 24 inches. What are the dimensions of the rectangle

Answers

Answer:

L=8, W=4

Step-by-step explanation:

2L+2W=p

2(4)+2(8)=p

8+16=24

Answer:

length = 8 in.; width = 4 in

Step-by-step explanation:

Tanyas heart rate is65 beats per minute. If her heart beats 757521 times how much time has elapsed

Answers

Answer:

11,654 minutes

Step-by-step explanation:

757521/65=11,654

Julio says, "If you subtract 19 from my number and multiply the difference by - 7, the result is - 28." What is Julio's number?
Julio's number is

Answers

Answer:

23

Step-by-step explanation:

Basically I did it backwards & opposites:

-28 divided by -7 = 4

4 + 19 = 23

I checked btw and it worked.

pls help question attached

Answers

The answer to your question is C

In the first round of a card game Nicki score 20 points then she lost 10 points on one turn and lost an additional 25 points on her final turn what is Niki‘s final score?

Answers

Her final score would be -15

Please help me with this problem

Answers

3 equivalent fractions for 2/3 are:

•4/6 (multiply the numerator and denominator by 2)
•6/9 (multiply the numerator and denominator by 3)
•8/12 (multiply the numerator and denominator by 4)

Basically all you have to do is multiply the numerator and denominator by any number as long as you keep it the same.

Hope you have a wonderful day ;)

Answer:

2/3

Step-by-step explanation:

2 / 3 x 1 = 2 /3

because you do 1x3 which gets you the bottom half then you do 2 x 1 which gets you 2 which equals 2/3

Hope this helps :) and if not I'm truly sorry

Which of the following relationships represents joint variation?

Answers

Answer:

y=7x

Step-by-step explanation:

that what I heard in math ok

Simplify the expression -7+(-3)-(-5)


I NEED HELP ASAP​

Answers

Answer:

It should be -5

Step-by-step explanation:

(9x + 11) what’s the answer?

Answers

Answer:

70 is the answer

Step-by-step explanation:

Answer:  (9x + 11) = 70

Step-by-step explanation:


How do I solve for c

Answers

Answer:

Uhhh add the top then divide by bottom

Step-by-step explanation:

Bc yes

Answer:

[tex] c = \dfrac{3e + 3d - 5D}{2b} [/tex]

Step-by-step explanation:

[tex] \dfrac{2bc + 5D}{3} = e + d [/tex]

Multiply both sides by 3.

[tex] 2bc + 5D = 3(e + d) [/tex]

[tex] 2bc + 5D = 3e + 3d [/tex]

Subtract 5D from both sides.

[tex] 2bc = 3e + 3d - 5D [/tex]

Divide both sides by 2b.

[tex] c = \dfrac{3e + 3d - 5D}{2b} [/tex]

What is the next number in the pattern?
1, 4, 7, 10,_

Answers

Answer:

13

Step-by-step explanation:

Throughout this pattern, each previous number is adding 3.

Hope this helps! :)

Need help please !!!

Will mark as brainliest!!!

Answers

Answer:

DW = 70

Given segments XW, YW, and ZW are perpendicular bisectors, the adjacent segments formed from the bisector are congruent.

All of your answers are correct, I checked!

Find the value of x.

Answers

Answer:

x=95°

Step-by-step explanation:

what is the greatest common factor of 15 and 42

Answers

Answer:

3

Step-by-step explanation:

The factors of 15 are: 1, 3, 5, 15

The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42

Then the greatest common factor is 3.

Answer:

3

Step-by-step explanation:

What is the image of the point (7, -5) after a rotation of 270°
counterclockwise about the origin?

Answers

Answer:

It should be (-5,-7)

Step-by-step explanation:

I used a graphing calculator and turned it each degree till I reached 270

PLEASE HELP ASAP! i’ll mark brainlest

Answers

Answer:

There are 15.748 inches in 40cm. Can I please have brainlest?

Step-by-step explanation:

Answer:

40cm

Step-by-step explanation:

If you are converting 40cm to one inch and the conversion ratio is 2.54 : 1, you would place 40 in the numerator as the original ration has 2.54/1 as a fraction and the same will apply to 40cm.

** This applies if you are finding which number is in the numerator and not the answer to how much 40cm in inches is.

37.5 to the nearest degree

Answers

Answer:

38 degrees

Step-by-step explanation:

if it is half a tenth or more, it gets rounded up to the next degree

Answer:

38

Step-by-step explanation:

pls help what's 9 divided by 7432

Answers

7432/9 = 825,7777777777778 = 825,8

Answer:

825.7 (the 7 is repeating)

Step-by-step explanation:

1. Divide

2. Multiply

3. Subtract

4. Bring down

Use these four steps to divide!

HELP me please and can you also explain

Answers

Answer:

B. 50%

Step-by-step explanation:

Paul: 25% + 50% = 75%

Janet: 50%

Combine both Janet's savings and Paul's savings:

75 + 50 = 100%

Marco is discussing how prices have changed with his son, Paul. Paul does not believe him, so they decide to research the price of their favorite food items. Use the information below to determine the percent change in the question below. Round your answers to nearest tenths place. What is the percent of change in the cost of a serving of fries?

Answers

Answer:

67 percent I think if not 62

Step-by-step explanation:

the following table gives the number of people on the titanic by class and whether or not they survived gi

Answers

Answer:

Where’s the rest of the question ??

Step-by-step explanation:

79.990 as a decimal??????? Help ASAP

Answers

Answer:

79.990 is a decimal

anyone know this pls help

Answers

I think it’s going to be 5

According to the U.S. Geological Survey, there are over 300,000,000 cubic miles of water on the planet. How this number represented in scientific notation
0 3 x 108
0 3 x 10°
30 x 108
0 30 x 10

Answers

Answer:

3 x 10^8

Step-by-step explanation:

300,000,000 in scientific notation is 3 x 10^8 and because it’s 8 zeros

The number 300,000,000 represented in scientific notation will be 3 × 10⁸. Then the correct option is A.

What is Algebra?

The analysis of mathematical representations is algebra, and the handling of those symbols is logic.

PEMDAS rule means the Parenthesis, Exponent, Multiplication, Division, Addition, and Subtraction. This rule is used to solve the equation in a proper and correct manner.

According to the U.S. Geological Survey, there are over 300,000,000 cubic miles of water on the planet.

Convert the integer number into scientific notation. Then the number can be written as,

300,000,000 = 3 × 10⁸

The number 300,000,000 represented in scientific notation will be 3 × 10⁸. Then the correct option is A.

More about the Algebra link is given below.

https://brainly.com/question/953809

#SPJ5

What slope is perpendicular to:
m = 5/8

Answers

the perpendicular slope would be m=-8/5

The slope that is perpendicular to m = 5/8 is given by; m' = -8/5

When dealing with slope - intercept form of equation of a line, the general equation is;

         y = mx + c

where;

m is the slope

c is the y-intercept

Now, for a line to be perpendicular to a line above that has it's slope as m, the slope of this new line will be the negative inverse of the first slope. This is;  m' = -1/m

Applying that to our question, it means the slope that is perpendicular to m = 5/8 is; m' = -1/(5/8) = -8/5

Read more at; https://brainly.com/question/21441448

Solve the equation.

4n−18=5

Answers

Answer:

n = 5.75

Step-by-step explanation:

4(5.75) - 18 = 5

4(5.75) = 23

23 - 18 = 5

Therefore, n = 5.75.

Hope this helps:)

I would appreciate it if you gave me brainliest. Thanks.

The answer
Is 5.75
That’s because 18+5=23 and 23 divided by 4 equals 5.75 and to make sure. 5.75*4=23 23-18=5.
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