It took 32 minutes for Ella to go to school on Friday.
Step-by-step explanation:
Time for first four days in minutes,
30,28,34,31
Let x be the time on Friday
Average = 31 min
As we know
![Average = \frac{Sum\ of\ term}{No.\ of\ terms}\\Average=\frac{30+28+34+31+x}{5}\\31=\frac{123+x}{5}](https://tex.z-dn.net/?f=Average%20%3D%20%5Cfrac%7BSum%5C%20of%5C%20term%7D%7BNo.%5C%20of%5C%20terms%7D%5C%5CAverage%3D%5Cfrac%7B30%2B28%2B34%2B31%2Bx%7D%7B5%7D%5C%5C31%3D%5Cfrac%7B123%2Bx%7D%7B5%7D)
Multiplying both sides by 5;
![5*31=\frac{123+x}{5}*5\\155=123+x\\x+123=155\\x=155-123\\x=32](https://tex.z-dn.net/?f=5%2A31%3D%5Cfrac%7B123%2Bx%7D%7B5%7D%2A5%5C%5C155%3D123%2Bx%5C%5Cx%2B123%3D155%5C%5Cx%3D155-123%5C%5Cx%3D32)
It took 32 minutes for Ella to go to school on Friday.
Keywords: Average, Addition
Learn more about addition at:
#LearnwithBrainly
Hai! So, I have all the math and explanations in the picture attached.
I forgot to add on there(and you'll see it) wen i subtract 3x and add 10 to the other side it cancels each other out. -3 + 3= 0 and -10 + 10 = 0. Etc.
Other than that, if you have any other questions, comment them down below. :)
Both of the statements are Theorems. Postulates are assumed to be true so they are really obvious things like a line has at least two points.
Answer:173
Step-by-step explanation:
Answer:
X = 100
Step-by-step explanation: