Answer:
It means: In the first quadrant (I), all ratios are positive. In the second quadrant (II), sine (and cosec) are positive. In the third quadrant (III), tan (and cotan) are positive. In the fourth quadrant (IV), cos (and sec) are positive.
Step-by-step explanation:
The square root of 4 is 2
Line 2 and Line 4 are perpendicular
Line 2: y=1/5x−3
Line 4: y+1=−5(x+2)
Lidal's price is better
Lidal
4 for £2.04
1 for £2.04/4= £0.51= 51 p
Oldi
9 for £4.68
1 for £4.68/9= £0.52= 51 p
Lidal offers better price per roll
