MATHEMATICS MIDDLE SCHOOL

car moves with speed of 80m/s to go from city A to city B for 12 hours. How long will it take to move car with speed of 60 m/s?​

Answers

Answer 1
Answer:

Answer:

16 hours

Step-by-step explanation:

velocity = distance / time => distance = velocity * time;

distance = 80 m/s * 12 hours

newVelocity = 60 m/s;

newVelocity = distance / newTime => newTime = distance / newVelocity = 80 m/s * 12 hours / (60 m/s) = (8/6) * 12 hours = 16 hours

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An even number divided by an even number cab be a/an:1. even number
2. odd number
3. mixed number

a. 1 only
b. 2 only
c. 1 and 2 only
d. 1 and 3 only
e. 1, 2, and 3

Answers

c only one and two is the answer

A plane at an altitude of 20000 feet starts to descend for landing after flying for six hours. The entire flight time was 6 hours 40 minutes. Determine the average rate of descent of the plane

Answers

Check the picture below.

so, let's see, the plane departs from (0, 0), the origin, goes up to 20000 feet, sticks around flying for 6 hours, 6hrs = 3600 minutes, (6*60).

so the plane's descent starts off at the point (3600, 20000) down to (3640, 0) as you see in the picture, keeping in mind that average rate of change = slope.

\bf (\stackrel{x_1}{3600}~,~\stackrel{y_1}{20000})\qquad (\stackrel{x_2}{3640}~,~\stackrel{y_2}{0}) \n\n\n slope = m\implies \cfrac{\stackrel{rise}{ y_2- y_1}}{\stackrel{run}{ x_2- x_1}}\implies \cfrac{0-20000}{3640-3600}\implies \cfrac{-20000}{40} \n\n\n \cfrac{-5000}{1}\cfrac{ft}{minute}\implies -5000(ft)/(min)

the slope is negative, since it's a descent, the plane is coming down, not going up over the minutes axis.

Answer: 500 feet per minute

Step-by-step explanation:

Landing time 40min with an altitude of 20000 remaining

40=20000 | both sides /40

1=500

PLEASE HELP!!!This is one question but with 3 parts; I answered 2 but I need one more.
Part one: Arif and Keisha go to a restaurant. their meal cost 13.75. The sales tax is 5%
I got $0.69.
Part two: They want to leave a 15% tip based on the bill and tax combined. I got $2.17
Now the part 3 I need help with says Arif ordered a more expensive meal than Keisha after tax and tip are figured he decides he should pay $3.00 more than Keisha. How much should he pay?

Answers

After you (correctly) answered part-2, you knew the total bill . . .

             (13.75 + 5%) + 15% on top of that.

             (13.75) + (0.69)  + (2.17)  =  $16.60 .

If they split the bill equally, each would pay  (1/2) (16.60) =  $8.30 .

But Arif wants to pay $3 more than Keisha.

Just take $1.50 away from Keisha's half (leave $6.80),
and add it on to Arif's half (make it $9.80).  Then their
total is the same, but his share is $3 more than her share.

                        $9.80  +  $6.80  =  $16.60

                        $ 9.80  -  $6.80  =  $ 3.00  .

Un muchacho compra el mismo numero de lapices que de lapiceros por 90 soles.Cada laliz le cuesta 3 soles y cada lapicero 7 soles. ¿Cuantos lapices y lapiceros ha comprado?

Answers

Answer:

pencils amount = 9   pens amount= 9

Step-by-step explanation:

We start this problem forming two linear equations system.

3*X+7*Y=90

Where X is the amount of pencils and Y is the amount of pens

The second equation is given by the statement, the amount of pencils is equal to the amount of pens, so the second equation is:

X=Y

Merging both equations we have:

3*X+7*X=90

Solving for X we have:

10*X=90

X=9

X=Y=9

(2 5/8 + 2 1/2) - 4 2/3

Answers

Steps:
1. Do 2 5/8 + 2 1/2 by changing them so they have the same denominators. Since 2 goes into 8, 8 would be your common denominator.
2. Multiply 2 times 4 which equals 8. Multiply 1 times 4 which equals 4
3. Your new problem is 2 5/8 + 2 4/8
4. This equals 4 9/8 which equals 5 1/8
5. Do 5 1/8- 4 2/3 by multiplying both denominators and numerators by 3 and the second mixed number by 8
6. 8 times 3 equals 24
1 times 3 equals 3
7. 5 3/24
8. 3 times 8 equals 24
9. 2 times 8 equals 16
10. 5 3/24 - 4 16/24
11. Take from the whole number in 5 3/24
12. 4 27/ 24 - 4 16/24
13. Your answer is 11/24
You need to change the fractions so that they all have a common denominator (the bottom half of the fraction). So you have to fond a number that all three denominators go into. You have 8, 2, and 3. They all go into 24. Times all the fractions by whatever they need to make the bottom 24. but you can only times them by 1, or else it will ruin your equation. [3/3 x 5/8 = 15/24] [12/12 x 1/2 = 12/24] [8/8 x 2/3 = 16/24] now plug your new fractions into the problem. (2 15/24 +2 12/24) - 4 16/24. simplify the part in the parenthesis first, (4 27/24) - 4 16/24. since you are subtracting, you can leave the part in parenthesis as a wrong fraction. now subtract. 4 27/24 - 4 16/24 = 11/24. you can't simplify that to be a smaller number, so that is your answer:)[11/24]

Help im dealing with music notes

Answers

Music fractions are kinda like math.

In 4/4 time a quarter note (indicated by the denominator of 4) gets one beat

In 6/4, the numerator indicates 6 beats per bar

In the unusual 4/8 time, the denominator of 8 indicates an eighth note gets one beat
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