exam Maths Puzzle Numerical Ability

Add 10c-1 and 4c-1

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exam Other Question

What is the transformational form of (x+2)^2+(y-1)^2=9???
I think it is [1/9(x-2)]^2+[1/9(y+1)]^2=1???????? One benefit of membership in a national honor society is a 25% discount on all history magazine subscriptions. Thomas used this dicount to order an annual subscrition to American Heritage magazine and paid $24. What was the cost of a regular subscription?