Michael has a savings account and saves the same amount each week. after 4 weeks he had $350 dollars, and after 9 weeks, he had $400 dollars. how much did he start with?

10000

step-by-step explanation: divide by 2,

hello :

by applying the distributive property :

6 × 4.3 = 6 × ( 4 + 0.3 )

            =   (6 ×   4) + (6 ×   0.3)

            = 24 + 1.8

6 × 4.3 = 25.8