exam Maths Puzzle Numerical Ability

Radioactive strontium-90 is used in nuclear reactors and decays exponentially with an annual rate of decay of 2.48%. How much pf 50 grams of strontium-90 will be left after 100 years?

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exam Other Question

Identify the axis of symmetry, create a suitable table of values, then sketch the graph (including the axis of symmetry). y=X^2-4x
Please assist me with this answer, and show me the proper graph and table.

Thanks I have the answer, I need explanation please.