exam Maths Puzzle Numerical Ability

Please help and solve this graph for me. y=-x^2-2x

x;-3 -2 -1 0 1
y;

Read Solution (Total 1)

x= -4, -3, -2, -1, 0, 1, 2, 3, 4
y = 24, 15, 8, 3, 0, -1, 0, 3, 8
9 years agoHelpfull: Yes(0) No(0)

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Find the half-life of a radioactive substance that is reduced by 30% in 20 hours 1/a - 3 - 1/a + 3 + 2a/a^2 - 9