Why do the inequality signs stay the same in the last two steps of this question. 3x-5< 19

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters .

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how