exam Maths Puzzle Numerical Ability

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?

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exam Other Question

I need to write an verbal expression for this.... 1/3a3 graph the solution set;
2x+4ygreater than or equal to 8

x+y less than or equal to 3