book Maths Puzzle Numerical Ability

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

6+-18/3
-18 squared

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book Other Question

.4999 x 16.00027 is equal to?

how would i solve this problem? Please help solve this problem thanks-

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?