book Maths Puzzle Numerical Ability

Can you help me solve the inequality:
x^2<10-3x
Thank you

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book Other Question

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? How do you find the domain for a question like y = one over x + 2