ok
so year 7 work then?
you dont need a lesson to figure this out.
you know that the amount of seeds in a packet is 10 metres squared.
you need to find out how many packets are needed to cover the AREA of this parallelogram. So you find the area. Dont know how? look up the formula on google. plug that formula into a regular calculator. now the area of the parallelogram is X metres squared. so you divide the area of the field (X) by how much land the packet covers (10) and you get the number of packets needed.