exam Maths Puzzle Numerical Ability

sample final question...trying to study correctly for final :

solve each equation:

log (7x+8) = 2 log x

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exam Other Question

(NH4)2SO4

the 4 after the H is supposed to be small &so are the 2 &4.

so when i multiply the 4 &two will it be 8 or 6???? Use the following table to answer the question.
Population of Europe by Age Groups Population (in thousands)
1950 1970 1995
Age