exam Maths Puzzle Numerical Ability

Solve the following equation:
4ax + by = 11ab
8ax - 5by = ab

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exam Other Question

can someone tell me what formulas do i use for these problems thanks

problem #8
which of the following investments is larger after 19years?
(a)$7500 is deposited annually and Hello! I recently tried to get the answer to this problem but asked in the wrong place. Could someone, anyone, please help me with this issue? I�m due to turn this in later today.