Can anyone help me on the summer and winter Gizmo questions. Activities A and B?

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.

Amira pulls a 3 pound wagon 4 feet. how much work has she done?