
Actually Welcome to the Concept of the Maths.
Cost of each ticket = £54
Glen purchased tickets= 4
total cost of tickets alone = 54*4 =£216
now calculation of the 5% tax of the tickets,
5/100 * 216 = £ 10.8
hence the total amount Glen has to pay is
=> 216+10.8 = £226.8
5x -20 + 2x -7
= 5x + 2x -20 -7
= 7x -27
A) 8 - (-2) = 10
B) -8 - (2) = -6
C) -2 - (-2)
D) 4-1
-5+5 is the pair that the sum is 0