To solve this algebraically, you can first factor out a 3:

Then, you can factor (I'm using guess and check) and my answer is -4 and 2:

From here on, finding 0s is very easy. You just solve for x in the parentheses. So,
the 0s are when x = 4, and x = -2. Remember, (4-4) = 0, and (-2+2) = 0, that's what you want.
5+2 = 7
Add 5 more (1 more magazine) and the total amount equals 12
So.. bought 2 erasers
Based on gas laws:
PV/T = Constant, P = Pressure, V = volume, T = Temperature (K)
Therefore,
P1V1/T1 = P2V2/T2
P1 = 10 psig
V1 = 10 in^3
T1 = 65°F = 291.483 K
P2 = ?
V2 = 1.5 in^3
T2 = 180°F = 355.372 K
Rearranging the equation,
P2 = P1V1T2/T1V2 = (10*10*355.372)/(291.483*1.5) = 81.279 psig
Rounded to one decimal place means to round to the nearest tenth (i.e. to the nearest 0.1)
4.25 (rounded to the nearest tenth) = <u><em>4.3</em></u>
You’d need 8 25-pound cocker spaniels