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A man is 5 times as old as his son 2 years ago the sum of the squares of their age was 114 find the present age of son?answer is 7? Find the average rate of change for the function.? Consider the reaction: 2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(l) Calc ΔHrxn, if the combustion of 30 g of C2H6(g) releases 777 kJ of heat.? Could you simply explain Planck's constant? Match the graph of the function on the right with the graph of its derivative. image uploaded?