All categories

3 years ago

Help me!! I need help fast.

Mathematics

2 answers:

Elden [556K]3 years ago

7 0

Hot air rises and cold air sinks

Doss [256]3 years ago

4 0

Cold air is heavier and more dense then hot air and therefore sinks. Hot air rises. An interesting reason that hot air rises is <em>because </em>cold air sinks. When the cold air sinks it pushes up the hotter air.

Hope this helped!

You might be interested in

For the first 30 km, the bicyclist rode with a speed of v km/hour. For the remaining 17 km he rode with a speed which was 2 km/h

damaskus [11]

Answer:

t= 2.52 hours

Step-by-step explanation:

It is given that for first 30 km, the speed of bicyclist is v km/hour

time taken to cover first 30 km is given by

$t_{1} =\frac{30}{v}$ ( $time=\frac{distance}{speed}$ )

for next 17 km the speed of bicyclist is 2 km/hour greater than his original speed

so the speed to cover next 17 km = v+2

time taken to cover next 17 km is given by

$t_{2} =\frac{17}{v+2}$

now total time t spent by the bicyclist to cover entire trip is given by

$t=t_{1} +t_{2}$

$t=\frac{30}{v} +\frac{17}{v+2}$

now if v=18 , we have

$t=\frac{30}{18} +\frac{17}{20}$

now to add fractions we make the denominator same

Hence we will find the LCM of 18 and 20

LCM of 18 and 20 = 180

now we need to make both the denominator equal to 180

$t=\frac{30(10)}{18(10)} +\frac{17(9)}{20(9)}$ $t=\frac{300}{180} +\frac{153}{180} =\frac{300+153}{180}$

$t=\frac{453}{180} =2.52$ hours (approx)

7 0

2 years ago

(HELP!!!) Gustavo invests £520 for 6 years in a bank account paying simple interest. At the end of 6 years, the amount in the ba

romanna [79]

629.20/520=1.21
Powerof6V1.21= 1.0323
Rate of interest 3.23

7 0

3 years ago

A child on a merry go round has a linear velocity of 6mph. If the child is sitting 10ft from the center of the merrry go round,

lara31 [8.8K]

Answer:

do u mind helping me for school ?

if so check my latest questions pls ty

Step-by-step explanation:

5 0

2 years ago

Those are my choices pls tell me which one would fit this problem!! <br>THERES A PIC ATTACHED

denis23 [38]

Answer: Opens up, has a minimum

Step-by-step explanation:

If the x^2 term is positive the parabola opens up, if it is negative it opens down. Minimum always goes with up, maximum with down

7 0

2 years ago

Researchers are concerned about the impact of students working while they are enrolled in classes, and they’d like to know if st

antoniya [11.8K]

Answer:

The 95% confidence interval based on this sample is =

[6.41, 7.79]

Step-by-step explanation:

The formula for Confidence Interval =

Mean ± z × standard deviation/√n

Sample mean = 7.1 hours

Standard deviation = 5 hours

n = 200 students

z = 95% confidence interval z score

= 1.96

C.I = 7.1 ± 1.96 × 5/√200

C.I = 7.1 ± 0.693

Hence, Confidence Interval

= 7.1 - 0.693

= 6.407

Approximately = 6.41

= 7.1 + 0.693

= 7.793

Approximately = 7.79

Therefore, the 95% confidence interval based on this sample is

[6.41, 7.79]

6 0

2 years ago