(iii) d) A pipe can fill a water tank in 1 hour. What part of the tank is filled by the pipe in 20 minutes ? (ii) If the capacity of the tank is 1500 litre, how many litres of water does the pipe fill in 20 minutes ?

1/3 of they tank can be filled in 20 min. and in 20 min, the pipe fills up 500 liters.

Step-by-step explanation:

So 20 minutes is 1/3 of an hour so it makes sense to say that 1/3 of the tank would be filled up in 1/3 of an hour. Next if the pipe can fill up the tank in 1 hr min then we would have to just divide it by 3 to find how much it can do in 20 min. So 1500/3 = 500 liters in 20 min. (Hope this helps)

10 - 8 = -2

  8 - 6 = -2

etc, so -2 is the common difference

step-by-step explanation:

1. a^4+8a^3+24a^2+32a+16

2.y^8+8y^7+28y^6+56y^5+70y^4+56y^3+28y^2+8y+1

3.x^6-3x^4y^2+3x^2y^4-y^6