book Maths Puzzle Numerical Ability

twice the sum of 4 and some number is 34 what is the number
could some please help i am stuck thank you mike

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book Other Question

Let T be a linear operator in V. Prove that T^2 = 0 if and only if the range T is a subset of null T. A store keeper goes to the bank to get $10 worth of change. He requests twicew as many quarters as half dollars, twice as many dimes as qurters, 3 times as many nickles as dimes, and no pennies or dollars. How many of each coin did the storekeeper get?