Điểm A (-2;0,25) thuộc đồ thị hàm số y=a/x

<=>x=-2;y=0,25

Khi  đó y=a/x<=>0,25=a/-2

<=>a=0,25.(-2)=-1/2=-0,5

 vậy...

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Statistics are (A) now compulsory (B) for all students taking (C) a course in engineering (D).

A.are 

B.compulsory

C.taking

D.engineering