exam Maths Puzzle Numerical Ability

4. The line

y=0.15x+0.79

represents an estimate of the average cost of gasoline for each year. The line

0.11x-y=-0.85

estimates the price

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exam Other Question

If one-half thenumber is subtracted from five-sixths of the number,the difference is 6. Find the number Find the center and the radius of the circle whose equation is given: x^2+y^2+6x+8=0
Center = (_,_) Radius = _