exam Maths Puzzle Numerical Ability

Please help me find the domain and write BOTH set-builder and interval notations for f(x)=x^2+x+105 over 5x-45.

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2a+x=3a+9 what is the answer to A grocer mixes two kinds or nuts. One kind costs $5.00/kg and the other $5.80/kg. How manykilogramsof each type are neededto make 40kg of a blend worth $5.50.