12 (a) State two advantages and two disadvantages of plastics
[4 marks)
(b) According to one study in science, Malaysia becomes the eight worst country
worldwide for plastic waste. Plastic waste is illegally dumped and burnt which
lead to respiratory diseases among people,
Explain how to overcome this problem
Your explanation should include the following aspects:
(i) Identify the problem
[1 mark]
(ii) Clarification of problem
[1 mark]
(iii) State three methods to solve the problem
13 marks)
(iv) Choose the best method and explain your choice
[1 mark]

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Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].

Just do the math, then think