exam Maths Puzzle Numerical Ability

Solve for x:
8(^2x)+8^x-12=0

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exam Other Question

17. A line passing through (13, 16) and (9, y) is parallel to a line with slope 2. What is the value of y? A man invests $2000 in a bank paying 5% simple interest per annum and $3000 in another bank paying 6% simple interest per annum. What rate percent does he recieve on the investments altogether?