exam Maths Puzzle Numerical Ability

M is the midpoint of QR. Q has coodinates (-3,5) and M has coordinates (7,-9) find the coordinates of R.

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Martha and Sally had lunch together on Tuesday. Sally paid $2 more than Martha. If the total bill was $5.64. How much did Sally pay for her lunch?

I need the answer :) Q#39. (heating water)the temperature of water in a heating ea keetle rises according to the equation y=30x+72, where y is the temperature (in degrees fahrenheit)x minutes after th