exam Maths Puzzle Numerical Ability

Find the value of c that will make;

9x2+30x+c a perfect square trinomial

thank -you please help

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exam Other Question

2. Combine like terms:
7x2 + 9x � 4x2 � 2 + 6x � 2x2 + 8 Media Services charges $20 for a phone and $30/month for its economy plan.
Formulate a model that can be used to determine the total cost, C(t), of operating a Media Services phone for t months.
C(t)=?

HELP!!!