All categories

3 years ago

the distance around a track is 400m. if you take 14 laps around the track what is the total distance you walk? use mental math

Mathematics

2 answers:

Olegator [25]3 years ago

6 0

to do it in mental math: you can ignore the zeroes in 400 for now.

4*14 = 4*10 + 4*4 = 40 + 16 = 56

now add the zeroes back on: 5600m

harkovskaia [24]3 years ago

3 0

Well, if you go around the track once, that's 400m. Going around the track once is one lap. So, if you went around 14 times, that would be going 400m each time. In your head, you would find the product of 14 and 400, which would be 5600m. Your total distance would be 5600m.

You might be interested in

In a box there are 6 orange balls, 4 green balls and "x" blue balls. If the probability of drawing a blue ball is 1/3, what is t

Scorpion4ik [409]

Step-by-step explanation:

I assume it is meant to draw 2 blue balls in a row out of the full pool of balls (no other draws happen before or during this process).

tricky, your teacher.

I think the temptation is to simply say 1/3×1/3 = 1/9.

but is it ?

the probabilty to draw one blue ball out of the complete system (no ball missing) is

x / (6+4+x) = 1/3

x = (6+4+x)/3

3x = 6 + 4 + x = 10 + x

2x = 10

x = 5

so, we have a system of 6 orange, 4 green and 5 blue balls (15 all together) .

the probability at our first pull to draw a blue ball is the indicated 5/15 = 1/3.

but now, for the second ball, we have only 6 orange, 4 green and 4 blue balls in the pool (14 altogether).

and so the probability to draw a blue ball out of this is

4/14 = 2/7.

therefore, the probability to draw 2 blue balls is now the combination

1/3 × 2/7 = 2/21

aha ! so, it is a little bit less than the originally suspected probability of 1/9.

5 0

3 years ago

Y/7+6=11<br> y=? solve this equation

Umnica [9.8K]

First multiply every thing by 7 to get rid of the fraction.

(y/7)(7) +6(7)=11(7)

y+42=77

y=35

5 0

3 years ago

Read 2 more answers

Simplify the expression 5+(4+x)

photoshop1234 [79]

5 + 4x
I think that’s right

4 0

3 years ago

Read 2 more answers

What is the approximate radius of a sphere with a volume of 138 cm?

Nimfa-mama [501]

Answer:

r = 3.21

Step-by-step explanation:

8 0

3 years ago

Courier charges for packages to a certain destination are 65 cents for the first 250 grams and 10 cents for each additional 100

lukranit [14]

Answer:

1050 g < weight ≤ 1150 g

Step-by-step explanation:

Let w represent the weight of the package in grams. The the number of 100-gram increments after the first 250 grams is given by ...

⌈(w-250)/100⌉ . . . . . . . where ⌈ ⌉ signifies the <em>ceiling</em> function

and the charges for a package exceeding 250 grams will be ...

0.65 + 0.10⌈(w -250)/100⌉ = 1.55

0.10⌈(w -250)/100⌉ = 0.90 . . . . . . . . subtract 0.65

⌈(w -250)/100⌉ = 9 . . . . . . . . . . . . . . . divide by 0.10

8 < (w-250)/100 ≤ 9 . . . . . . . . . . . . . . meaning of ceiling function

800 < w -250 ≤ 900 . . . . . . . . . . . . . multiply by 100

1050 < w ≤ 1150 . . . . . . . . . . . . . . . . . add 250

The weight in grams could be greater than 1050 and at most 1150 for a charge of $1.55.

3 0

3 years ago