book Maths Puzzle Numerical Ability

what is 2/9 plus 5/6 plus 1/4?

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If you could, please help me with these 2 problems.
The directions says to simplify the variable expressions.
(-14)(-y^2)
and
8(-y^2)^2
The amount A in an account after t years of an initial principle P
invested at an annual rate r compounded continuously is given by A
= Pe^rt where r is expressed as a decimal. W