Answer:
Step-by-step explanation:
To find the best place to buy the video game, we need to find the price for each store, and see which is least. To do this, find the percents of each and subtract.
To find the percent, simply multiply your original number by a decimal version of the percent
Ex: 160* .4=64
155*.3=46.5
160*.2=32.
Then, subtract the amounts from each price.
160-64=96
155-46.5=108.5
160-32=128
Clearly, store a is the best place to buy the system.
Hope this helps!
Answer:
1.49216*10^8 km
Step-by-step explanation:
The first thing is to pass all the distances to the same unit system, since the distance from the earth to the sun is in kilometers and from the earth to the moon is in meters, therefore we will pass the distance of the moon in kilometers:
3.84 x 10 ^ 8m * 1 km / 1000 m = 3.84 x 10 ^ 5 km
To calculate the distance between the moon and the sun, it would be the difference between the distance they give us in the statement, because they have a point in common which is the earth, it would be:
1.496 x 10 ^ 8 km - 3.84 x 10 ^ 5 km = 149216000 = 1.49216 * 10 ^ 8 km
Therefore the distance between the moon and the sun is 1,49216 * 10 ^ 8 km
Answer:
C)
Step-by-step explanation:
the addition of 120k and 215j is less or equal to 2500
The speed of wind and plane are 105 kmph and 15 kmph respectively.
<u>Solution:</u>
Given, it takes 6 hours for a plane to travel 720 km with a tail wind and 8 hours to make the return trip with a head wind.
We have to find the air speed of the plane and speed of the wind.
Now, let the speed wind be "a" and speed of aeroplane be "b"
And, we know that, distance = speed x time.
![\text { Now, at tail wind } \rightarrow 720=(a+b) \times 6 \rightarrow a+b=\frac{720}{6} \rightarrow a+b=120 \rightarrow(1)](https://tex.z-dn.net/?f=%5Ctext%20%7B%20Now%2C%20at%20tail%20wind%20%7D%20%5Crightarrow%20720%3D%28a%2Bb%29%20%5Ctimes%206%20%5Crightarrow%20a%2Bb%3D%5Cfrac%7B720%7D%7B6%7D%20%5Crightarrow%20a%2Bb%3D120%20%5Crightarrow%281%29)
Now at head wind → ![720=(a-b) \times 8 \rightarrow a-b=\frac{720}{8} \rightarrow a-b=90 \rightarrow(2)](https://tex.z-dn.net/?f=720%3D%28a-b%29%20%5Ctimes%208%20%5Crightarrow%20a-b%3D%5Cfrac%7B720%7D%7B8%7D%20%5Crightarrow%20a-b%3D90%20%5Crightarrow%282%29)
So, solve (1) and (2) by addition
2a = 210
a = 105
substitute a value in (1) ⇒ 105 + b = 120
⇒ b = 120 – 105 ⇒ b = 15.
Here, relative speed of plane during tail wind is 120 kmph and during head wind is 90 kmph.
Hence, speed of wind and plane are 105 kmph and 15 kmph respectively.