Which elements have similar behavior? barium, silicon, aluminum, strontium, osmium, beryllium

1. are the triangles similar and if so why? what is the value of x? show your work.

5x + 2 = 12 solve the following equation. then place the correct number in the box provided.

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?