Answer:
Mrs. Etercsid
Step-by-step explanation:
One thing we can do is just multiply the averages by the percents in each class and compare from there.
To get from percentages to decimals, we can divide by 100.
For Mr. Tats:
Homework: 25 % -> 0.25
Participation: 10% -> 0.1
Test: 40% -> 0.4
Final: 0.25 -> 0.25
For Mrs. Etercsid:
Homework: 15% -> 0.15
Participation: 10% -> 0.1
Test: 60% -> 0.6
Final: 15% -> 0.15
We can then multiply the averages by the decimals for each teacher and add them up.
Mr. Tats:
0.25 * 81 + 0.1 * 57 + 0.4 * 93 + 0.25 * 87 = 84.9
Mrs. Etercsid:
0.15 * 81 + 0.1 * 57 + 0.6 * 93 + 0.15 * 87 = 86.7
You would get the higher grade with Mrs. Etercsid
33.4 kW/ hr is generated when the sky is cloudy and clear.
<u>Step-by-step explanation:</u>
Power generated per day when the sky is cloudy = 400 kW
Power generated per day when the sky is clear = 400 kW
Power generated per hour when the sky is cloudy or clear = 
Power generated per hour when the sky is cloudy and clear = 16.7 + 16.7 = 33.4 kW
It will take 133 days for Janet to save the money.
In order to find this, start by finding out how much more she needs to save. To find this, subtract the amount she has from the total goal amount.
500-120 = 380
So we know that she needs $380. To find how many weeks that it, divide the total amount needed to save by the amount she can save a week.
380/20 = 19 weeks.
Now to find the number of days, multiply the weeks by the number of days in a week.
19 x 7 = 133 days
Simplifying
12x + -8x = 12
Combine like terms: 12x + -8x = 4x
4x = 12
Solving
4x = 12
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Divide each side by '4'.
x = 3
Simplifying
x = 3
