The expression 2*(6+7) represents the total cost of the seed packets.
The factor "2" represents the packet cost per unit ($/packet). Then, to find the total cost, we have to multiply that factor by another that represents all the packets he is buying.
This last factor is what is expressed as a sum "6+7".
This sum represents the packets he is buying separated in two terms:
- "6" represents the packets of lettuce seeds.
- "7" represents the packets of pea seeds.
If we look at the expression without the parenthesis, like 2*6+7, it will have a different result than 2*(6+7) because we are changing the order by which operations are solved.
For 2*6+7, we solve 2*6 first and then add 7 to the result.
In the case of 2*(6+7), because of the parenthesis, we first solve the sum whitin the parenthesis and then we multiply the result by 2.
2*6+7 may represent another situation.
We can represent with this equation the following situation: "Martin has 2 bags of 6 kg of sand and one bag that weights 7 kg of sand. The expression 2*6+7 represents the total amount of kg of sand he got".
Answer:
The part in parenthesis shows the sum of 6 and 7.
The sum represents the number of packets of lettuce seeds plus the number of packets of pea seeds.
One of the factors is 2. The other factor is the sum of 6 and 7
The product represents the price per packet times the number of packets Martin bought.