book Maths Puzzle Numerical Ability

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Solve each system by the addition method

Nickels and Dimes. Winborne has 35 coins cinsisting of dimes and nickels. If the value of his coins is $3.30, then how many of each type does he have?

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book Other Question
I need help with writing this in the form a + bi.

6+-18/3
-18 squared Determine whether the relation is a function.

X |-5|0|2|6|
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Y | 0|1|2|3|


A) Function

B) Not a function