A teacher asked the students to write the following statements :
(i) Twice of x plus four
(ii) Three time x minus 7
Students responded as 2x + 4 and 3x - 7, while the teacher was expecting 2(x + 4) and 3 (x - 7). The above mistakes have occurred due to
1
lack of understanding of linear expressions
2
lack of appropriate practice of writing linear expressions
3
careless listening by students
4
language used by teacher