Solve 3x +1 =3
tell me how to do these types of questions as well as the answer

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct