Answer:
15 minutes
Step-by-step explanation:
Their rate together is 1/6 floor per minute.
Her rate alone is 1/10 floor per minute.
His rate is the difference of these:
1/6 - 1/10 = 5/30 -3/30 = 2/30 = 1/15 . . . . floor per minute
It would take Jacob 15 minutes to do it alone.
add d to both sides
c(a+b) = f + d
divide away c
a+b = (f+d)/c
subtract b from both sides:
a=[(f+d)/c]-b
So you have to find something that multiples to six but also somehow either subtracts or adds to five. So I would pick 2 and 3 because two plus three is five. Then you would write out your equation
X2+2x+5x+6
This may not be the way your teacher taught however it is much easier for me to do it this way.
A
you need to open ()
two minueses together is plus
so its 7+4=11
For this case we must do a conversion. By definition we have to:
1 milligram equals 1000 micrograms
1 liter equals 1000 milliliters
So:
Answer: