exam Maths Puzzle Numerical Ability

I am the neighbor of the kid next door...could you remind me how to do this so I can help him do his math? :-0

a+(a*2)=27

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exam Other Question

18. Graph the quadratic equation after completing the given table of values. y = -x^2 - 2x

x y
-3
-2
-1
0
1
The cost of using a calling card is $.95 for the first minute and $.35 for each additional minute. The function is C (t)=.95+.35(t1) where t=time in minutes. What is the charge for 12 minutes?

Thank you.