exam Maths Puzzle Numerical Ability

solve each systems by substitution:

4x-12y=5
-x+ 3y=-1

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exam Other Question

Suppose $500 is invested at 6% annual inerest compounded twice a year. When will the investment be worth $1000? Science and medicine. Celsius temperature readings can be converted to Fahrenheit readings using the formula
F= 9/5C+32

What is the Fahrenheit temperature that corresponds to