jason has 12 coins in his pocket ,he has twice as many nickles as he has quarters how many nickles does jason have

Answer 1

x + 2x = 12

3x = 12

x = ?

Answer 2

How can I represent (a+b+c)^2=a^2+b^2+c+2ab+2bc+2ac
using card board pieces

please help i have to submit it tommorow so please help me fast