exam Maths Puzzle Numerical Ability

Identify the type of function represented by y=(x+1)^2-4.

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exam Other Question

A store bought a $1000 shipment of sweaters and offered them for sale after a $15 markup on each sweater. All but 10 sweaters were sold, and the store made a $400 profit on the sweaters. How many sweaters did the store buy? Can someone explain to me what are some challenges about working with rational expressions? What are some strategies to develope to overcome these challenges.