exam Maths Puzzle Numerical Ability

please help me solve this equation:

18x + 5y = 100

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exam Other Question

Factor completely. b^2 - ab - 6a^2

A) (b + 3a)(b - 2a)
B) (b + 6a)(b - a)
C) (b - 3a)(b + 2a)
D) (b - 6a)(b + a)

either this is a typo or I did something Use the Factor Theorem to determine whether x - c is a factor of the following function. Write in the form f ( x ) = (x - c) (quotient) if f( x ) = -4x^3 + 5x^2 + 8; c = -2