Question

The product of 3x and (3x+1) is a t least 35

Answer 1

Product means the sum of two things i.e. the product of 1 and 2 is 3 (1 + 2 = 3)

So the product of 3x and (3x+1) can be written as:
35 < 3x + 3x + 1
^ Greater than 35 i.e. at least 35
35 < 6x + 1
34 < 6x
34/6 < x
17/3 < x
5.67 (2dp) < x