Which sequence(s) represent an arithmetic sequence?

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

Antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

How do i multiply two digit numbers