exam Maths Puzzle Numerical Ability

what are 2 functions for the following equation:

((x+1)/10)^2 + (y/5)^2 = 1

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Any help with this word problem would be appreciated. thank you in advance.

A man goes into a grocery store and buys a grapefruit and a toy ball. A 7% tax is applied to the pr what is the answer to 18= -a + 2