Mathematics Middle School

Albert thought of a number, added 5, multiplied the result by 2, took away 6 and then divided by 2 to give an answer of 8

Answers

Answer 1

The number he thought was 6.

Answer 2

x=number
((((x+5)*2)-6)/2)=8
(((x+5)*2)-6)=8*2
((x+5)*2)=16+6
(x+5)=22/2
x=11-5
x=6

Related Questions

simplify.
-5 ( x - 3) + 2 ( a - 9)
-5x + 2a + 33
-5x + 2a + 4
-5x + 2a - 33
-5x + 2a - 4

Answers

Answer:

Step-by-step explanation:

-5(x+3) + 2(a-3

-5*x =-5x

-5*3= -15

2*a=2a

2*9=18

-15+18=3

so the answer is -5x+2a-3

1.Write Paulo's time in standard notation

2.Miguel ran a marathon in 4 h and 16 min.Who ran the race in the shorter amount of time.Show your work.

HELP DONT ANSWERED IT JUST TO GET POINTS I NEED HELP THIS NEEDS TO BE TURNED IN @6

Answers

I'm not sure about a but b is:
You have to convert 1.56x10^4 into a normal number so that is : 15600
Then you convert 15600 into hours and seconds:
15600/60=260
260/60=4.3recurring
4 hours and 3recurring seconds

So that means Miguel ran the race in a shorter amount of time.

If there are a number of different sounds being produced simultaneously, the resulting intensity is the sum of the individual intensities. How many decibels louder is the sound of quintuplets crying than the sound of one baby crying?

Answers

Formula: Δ L = 10 × log n.
Δ L = level difference.
n = number of equal loud sound sources.

n = 5
10 × log10 5 = +6.9897 dB compared to the case that only one source is available.

Final answer:

The sound of quintuplets crying is 7 dB louder than the sound of one baby crying because a factor of five in intensity corresponds to a 7 dB increase in sound intensity level.

Explanation:

The question asks how many decibels louder the sound of quintuplets crying would be compared to the sound of one baby crying. To calculate this, we need to understand that intercity levels in decibels (dB) are measured logarithmically. This means that for every ten-fold increase in intensity, the sound level goes up by 10 dB. We also know that a factor of five in intensity corresponds to an increase of 7 dB.

If one baby crying produces a certain sound intensity, then five babies (quintuplets) crying simultaneously would increase the intensity by a factor of five. Hence, the sound of quintuplets crying would be 7 dB louder than the sound of one baby crying, based on the given references.

How can i do this? I don't quite understand "give an example of when it might be appropriate to estimate an answer rather than provide the exact answer" Thanks for your help

Answers

Imagine that you are planting flowers. The row is 68.5cm long. The plants should be 7cm apart. How many do you need. You know 68.5 is close to 70 and the plants should be 7cm apart and you know 70 divided by 7 is 10. So 10 plants should be enough. The reason why I rounded 68.5 because I needed to make the numbers easy to divide so I can get to answer that is close to what I need. If this example and my explaining did not help then I am sorry,

The human body is 70% water on average. About how much water will be in a person that weighs 140 pounds?

Answers

For this, you would need to find 70% of 140. To do so you must do the following: 140 x 0.7, which would lead you to the following answer: 98. So, if someone were to weigh 140 pounds, they would have around 98 pounds of water in their body!
I hope this was helpful, and if you need any more help, please let me know so I can further assist you.

Please answer all the questions (a,b, and c)

Answers

A.
Okay Each game costs $24.99 and Sandy wants 5.

24.99 × 5 ≈ 124.95 And your estimate should be $125

B. Sandy doesn't have enough money. She only has $115 and the games in total cost $124.95.

C. My estimate is higher because I rounded up.

B. She does NOT have enough money, because when you add 24.99 5 times you end up with it equalling 124.95, and Sandy only has 115. So she can't afford 5 video games.

Also, just for your safety, please don't take pictures of your school with your full name on it. Its a safety hazard. And I don't want anything to happen to you if there is a crazy person on here....

a jet takes 5 3/4 hours to fly 2,475 mi from new york city to los angeles. about how many hours will a jet flying at the same average rate take to fly 5,452 mi from los angeles to tokyo? Please explain using ratios.

Answers

We have:

Time = 5³/₄ hours
Distance = 2475 miles
Speed = Distance ÷ Time
= 2475 ÷ 5³/₄
= ⁹⁹⁰⁰/₂₃ = 430.43 miles/hour

Distance LA - Tokyo = 5452
Speed = 430.43 miles/hour
Time = Distance ÷ Speed
= 5452 ÷ 430.43
= 12.7 hours

Using ratios:

2475 miles ⇒ 5³/₄ hours
5452 miles ⇒ x hours

Find the multiplier ⇒ 5452 ÷ 2475 = 2.203
Then multiply 2.203 by 5³/₄ to get 12.7 hours

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Answers

The correct answer that you are looking for is C ( 75,000).

The correct answer is A. 70,000. Because your looking at 4 to round up the seven but because 4 is lower than 5 it would just be 70,000

The perimeter of a geometric figure is the sum of the lengths of its sides. If the perimeter of the pentagon to the right (five-sided figure) is 96 meters, find the length of each side. 2 of the sides= 2.5x

Answers

Final answer:

The length of each side of the pentagon is 19.2 meters.

Explanation:

To find the length of each side of the pentagon, we need to divide the perimeter of the pentagon by 5, since a pentagon has 5 sides. If the perimeter is 96 meters, each side would have a length of 96/5 = 19.2 meters.

whats the equivalent expressions by conbining like terms 5a+ 4+ 2a

Answers

7a+4, when combining like terms simply add together the things that look alike

If you add 5a and 2a you get 7a then you are left with 4. Meaning, your answer would be 7a+4. Since 4 doesnt have a variable, you dont add it to 7a.

According to the general equation for conditional probability, if P(A^B)=3/4 and P(B)=4/5, what is P(A B)?

Answers

I found that P(A B) equals 0.96

Answer:

0.96

Explanation:

A rule of conditional probability states that

P(A∣B)=P(A∩B)P(B)

So in this case it would be:

P(A∣B)=4556=4⋅65⋅5=2425=0.96

x over 4 + 1 = -5 solve the equation
A. -2
B 16
C. 4
D. -24
My answer is C, please correct me if I'm wrong.

Answers

I got x= -25

Hope this helps.

There are 117 stuff members in your school. 1/3 of them are going away for the thanksgiving holiday. How many staff members are not traveling.

Answers

Hey You!

117/3 = 39
39*2 = 78

So, 39 members are going away for the Thanksgiving Holiday, and 78 will remain.

explain: staff members away= 117×1/3,then we use the total number of members and minus the one who is away and we get

Staff members not travelling
=117-117×1/3
=117-39
=78

The ratio of boys to girls in the Science Club is 3:5. If there are 60 girls, how many boys are there?
A) 23
B) 36
C) 38
D) 45

Answers

25 boys.

15/3 = 5

5*5=25

The answer is B, 36.

This is because 5 x 12 is 60, and 3 x 12 is 36. Have a good day.

Si S es el 150% de T, qué tanto por ciento de T es (S + T)?

Answers

Final answer:

If S is 150% of T, then to find what percentage (S + T) is of T, we calculate (S + T) / T * 100. By substituting S = 1.5T into the equation, we determine that (S + T) equals 250% of T.

Explanation:

If S is the 150% of T, this implies that S is 1.5 times T (since 150% can be expressed as 1.5 in decimal form). To express S as a percentage of T, we can set up the equation S = 1.5T.

Now, we are asked to find what percentage of T is (S + T). To find this, we simply add S and T together: S + T = 1.5T + T = 2.5T. Now, to express this sum as a percentage of T, we divide the sum by T and then multiply by 100.

So, ((S + T) / T) * 100 = (2.5T / T) * 100 = 2.5 * 100 = 250%. Therefore, (S + T) is 250% of T.

To find the percentage that (S + T) is of T, we first need to find the value of S and T. The given information states that S is 150% of T. This means that S = 1.5T. To find (S + T), we substitute the value of S in terms of T: (1.5T + T) = 2.5T.

Now, to find the percentage that (S + T) is of T, we divide (S + T) by T and multiply by 100: ((2.5T / T) imes 100) = 250%.

Therefore, (S + T) is 250% of T.

what is 7/12 plus 1/4

Answers

7/12 + 1/4
Find common denominators.
12x1=12
4x3=12
Multiple 4 by 3 in the second fraction to make a common denominator. What you do to the denominator you do to the numerator, so 1x3=3 and 4x3=12
7/12+3/12=10/12
To put into lowest terms divide the numerator and denominator by 2, since they share a factor.
The answer is 5/6

Answer:

5/6

Step-by-step explanation:

the answer above is correct

If a and b are any two real numbers, explain how you calculate the difference a - b. Be sure to include the following in your explanation.
(A) a description of the relationship between addition and subtraction
(B) how you can use a number line to help with the calculation
(C) how you can determine the sign of the result

Answers

- Subtraction can be thought of as the inverse operation of addition, OR as addition itself, if you look at it as adding a negative number.

- The number line allows us to interpret subtraction (or addition of a negative) geometrically; we can view it as a movement to the left on the number line with a distance equal to the number being subtracted.

- Lastly, the value of any expression a - b (where a and b are real numbers) is determined by the relative sizes of the numbers. If a > b, then a - b > 0 (a positive result). If b > a, then a - b < 0 (a negative result.

Mary buys a dress and a pair of shoes. Before adding the tax she pays $ 48 for the dress which normally sells for $ 62, and she pays $ 34 for the shoes which normally sell for $46.

Answers

Hello! I can help you with this!

a. To find out how much Mary saved, we will have to subtract the sale price from the original price, and then add up the difference to find how much she saved. 62 - 48 is 14. 46 - 34 is 12. 14 + 12 = 26. Mary saved $26 by buying at the sale item price.

b. To find the amount of discount, we can write and solve a proportion, by setting it up like this: change/original = x/100. Change is the distance between two numbers and the original is the previous price. If you know about proportions, you cross multiply the values, and then divide each side by a number to isolate "x". If you solve each proportion correctly, here are your answers for each item:

Dress: ≈ 23% discount
Shoes: ≈ 26% discount

c. Okay. So when we add up the sales prices together, 48 + 34 is 82. In order to find the total amount with tax, we multiply the sale price, by (1 + r). In other words, add 1 to the rate in decimal form and multiply it by the total of the sales price. 82 * 106.5% (1.065) is 87.33. Mary paid a total of $87.33.

Josh walked a total of 5 miles today. First he walked 1 mile from his house to the park then he walked laps around the 3/4 mile loop trail at the park. Finally he walked back home. Howany laps did Josh walk around the trail?

Answers

Josh walked 4 laps around the trail.

To find out how many laps Josh walked around the trail, we first need to calculate the distance he walked from his house to the park and back, and then subtract that from the total distance.

Distance from home to park: Josh walked 1 mile from his house to the park.

Distance from park to home: He also walked 1 mile back home.

Now, let's calculate the total distance Josh walked around the trail:

Total distance walked = Total distance - (Distance from home to park + Distance from park to home)

Total distance walked = 5 miles - (1 mile + 1 mile)

= 5 miles - 2 miles

= 3 miles

Now, we know that Josh walked laps around a 3/4 mile loop trail, and he walked a total of 3 miles. To find out how many laps he walked, we divide the total distance by the distance of each lap:

Number of laps = Total distance / Distance per lap

= 3 miles / (3/4 mile)

= 3 miles * (4/3)

= 4 laps

So, Josh walked 4 laps around the trail.

Please help for points 12 minutes help.

Answers

The answer is A. The only answer that shows that point C is -0.38 is when its before -0.4 and close to -0.4.

what is 3/4 of 1/3 of a mile ???

Answers

3/4 of 1/3 of a mile is .25 of a mile

That is 0.25 of a mile, which is 440 yards.

what is the equation of the line shown in this graph.

Answers

Y+1 is the answer and yes the variable x is a substitute for an unknown number

Bill drove from Washington DC to Charlotte in 6.5 hours. What was his average speed in miles per hour?

Answers

If you search it up, the distance from Washington DC to Charlotte is 404.9 miles.

The formula for speed is distance divided by time. We can easily do that with this equation:

404.9 / 6.5 = 62.2923077, or about 63 miles per hour.

Please help me now ! Thank you

Answers

First we'll do two basic steps. Step 1 is to subtract 18 from both sides. After that, divide both sides by 2 to get x^2 all by itself. Let's do those two steps now

2x^2+18 = 10
2x^2+18-18 = 10-18 <<--- step 1
2x^2 = -8
(2x^2)/2 = -8/2 <<--- step 2
x^2 = -4

At this point, it should be fairly clear there are no solutions. How can we tell? By remembering that x^2 is never negative as long as x is real.

Using the rule that negative times negative is a positive value, it is impossible to square a real numbered value and get a negative result.

For example
2^2 = 2*2 = 4
8^2 = 8*8 = 64
(-10)^2 = (-10)*(-10) = 100
(-14)^2 = (-14)*(-14) = 196

No matter what value we pick, the result is positive. The only exception is that 0^2 = 0 is neither positive nor negative.

So x^2 = -4 has no real solutions. Taking the square root of both sides leads to

x^2 = -4
sqrt(x^2) = sqrt(-4)
|x| = sqrt(4)*sqrt(-1)
|x| = 2*i
x = 2i or x = -2i
which are complex non-real values

Can someone please help me with this math problem?? Number 13

Answers

a. 1x1 = 1 in
b. 0.5 x 0.5 = 0.25 in
c. 0.25 + 0.25 + 0.25 = 0.75 in

1x1=1 in.²
1/2x1/2=1/4 in.²
1-1/4=3/4 in²

The greater of 2 consecutive even integers is 18 less than 3 times the smaller integer. What is the greater integer?

Answers

3x-18 =x+2

2x-18 =2

2x = 20

x = 20/2 = 10

larger number is 12

4sin theta + 3 square root of 3 = square root of 3

Answers

Solving for θ:

4sinθ + 3√3 = √3

First subtract 3√3 from both sides:

4sinθ = -2√3

Now, divide by 4:

sinθ = (-2√3)/4
sinθ = -√3/2

Using the unit circle we know that sin of -√3/2 is 240° or 4/3π and 300° or 5/3π

Hope this helps!

Suppose △ITH≅△APG.

Which congruency statement is true?

Answers

△ITH≅△APG.

answer
B. IH = AG

It is given that the triangles ITH and APG are congruent.

When the two triangles are congruent, then the corresponding angles and sides are congruent to each other.

By being congruent, the corresponding angles which are congruent are:

[tex]IT \cong AP, TH \cong PG, IH \cong AG[/tex]

Therefore, [tex]IH \cong AG[/tex]

SO, Option 2 is the correct answer.

A class has 24 students. The teacher asks how many students in the class have pets and finds 5/8of the students have pets. Write a multiplication problem. How many students have pets?

Answers

24 × 5/8 = 15, you can cross multiply by doing x/24 = 5/8 And solve for x

Gordon read 18 pages of a book in 40 minutes. What was the unit rate per minute? Per hour?

Answers

18 pgs. in 40 min = 0.45 pages per min

27 pages per hour and 0.45 pages per minute.

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