Answer: Each notebook cost $2.55
Step-by-step explanation:
You divide $15.30 by 6, which equals $2.55.
Answer:
D. m+s=30
2m+3s=75
Step-by-step explanation:
let m be the no of multiple choice questions and s be the short questions then there are a total of 30 questions
m+s=30------A
there are 2 points for m(multiple choice questions) and 3 points for short questions (s) and totalling to 75
2m+ 3s=75
Answer:
-4d+2f
Step-by-step explanation:
By subtracting 2d from 6d, it would result in -4d
By combining -3f and 5f, it would result in 2f
<span>30 hours
For this problem, going to assume that the actual flow rate for both pipes is constant for the entire duration of either filling or emptying the pool. The pipe to fill the pool I'll consider to have a value of 1/12 while the drain that empties the pool will have a value of 1/20. With those values, the equation that expresses how many hour it will take to fill the pool while the drain is open becomes:
X(1/12 - 1/20) = 1
Now solve for X
X(5/60 - 3/60) = 1
X(2/60) = 1
X(1/30) = 1
X/30 = 1
X = 30
To check the answer, let's see how much water would have been added over 30 hours.
30/12 = 2.5
So 2 and a half pools worth of water would have been added. Now how much would be removed?
30/20 = 1.5
And 1 and half pools worth would have been removed. So the amount left in the pool is
2.5 - 1.5 = 1
And that's exactly the amount needed.</span>
