Answer:
At new year would be 100 $
Step-by-step explanation:
Because yuu know that January is after december and if you know that in one month would be 5 weeks and for that the boy put 20 dollars each week then you need to multyply 20×50=100
its 160 because 20 x 8 equals 160
has infinite solution
(x,y)=(1-2a,a) where a is an element of any real number
