exam Maths Puzzle Numerical Ability

A BACTERIA CULTURE STARTED WITH A COUNT OF 480 AT 8:00 A.M. AND AFTER t HOURS IS EXPECTED TO GROW TO f(t)=480(3/2)t. ESTIMATE THE NUMBER OF BACTERIA IN THE CULTURE AT NOON THE SAME DAYS.

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exam Other Question

A certain sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of interest from both investments is $91.00. How much is invested at 8%. Can you show me how you work it out and solve it? Factor a^2(b-c)-16b^2(b-c)