When they work together, it takes John 1/x hours and it takes Brian 1/(x+15) hours to complete 1/4 of the model.
1/x + 1/( x+15 ) = 1/4 / · x ( x+15 )
x+15 + x = x ( x+15 ) /4 / · 4
8 x + 60 = x² + 15 x
x² + 15 x - 8 x - 60 = 0
x² + 7 x - 60 = 0
x² + 12 x - 5 x - 60 = 0
x · ( x + 12 ) - 5 ·( x+ 12 ) = 0
( x + 12 ) · ( x - 5 ) =0
x = - 12 ( not accepted ) or x = 5
The time taken by Brian: 5 + 15 = 20 hours
So,
Reggie has enough flour to last for 40 days.
Increasing his use of flour by 25% will reduce how many days of flour he will have by 25%, leaving him with 75% of the original number of days of flour left. We can do simple multiplication to find our result.
If Reggie increases his use of flour by 25%, he will have 30 days' worth of flour.
Infinite series can either be convergent or divergent. It is convergent if the series has a limit and would approach a certain real number. It is divergent if it has no limits.
The given above is a series that is comprised of whole numbers and can go as large as the positive infinity. Because of this, the answer to this item is Divergent.
Answer:
x int (18/5,0)
y int (0.-2)
Step-by-step explanation:
by substitution