exam Maths Puzzle Numerical Ability

graph the solution set;
2x+4ygreater than or equal to 8

x+y less than or equal to 3

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exam Other Question

you need to select a 4 character password for a computer account. Any digit 0-9 and any letter A-Z can be used for a character, and digits and letters can be repeated. How many possible passwords are there? He there im stuck on a problem I cant figure out.

Simplify by removing a factor equal to 1

8y^5 z^3 /
4y^9 z^4