exam Maths Puzzle Numerical Ability

please help me sovle this question (y-24=-7)

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exam Other Question

find the product

(x-4y)(5x-9y)

a. 5x^2-29xy-29y^2
b. x^2-29xy+36y^2
c. x^2-29xy-29y^2
d. 5x^2-29xy+36y^2 Find the surface area of a cylinder if the height is 9 meters and the radius of a base is 6 meters. Use pie( no way to type sign) equals 3.14 and round to the nearest whole number.