exam Maths Puzzle Numerical Ability

solve the equation and state a reason for each step:

2(x-1)+3=17

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exam Other Question

find the y-intercept of the cubic f(x)=(x-2)(x+1)(x-3)

my ans was (0,-6)

was I right
Multiply and simpplify. (Type exponential notations with positive exponents)

36c^2/5c^2 - 10c + 5 * 5c - 5/6c=