How to turn 3x + (-5)= 19 into a 3 step problem not 3 problems for rational numbers

Answer for 10 points show work you guys in advanced < 3

Determine the lengths of the sides of the rectangle using the given area. give answers both exactly and approximately (to the nearest tenth). the area of the rectangle is 46 cm2.

If the class creates a histogram of the data in table, how many students are in the range 12cm to 13.9 cm