exam Maths Puzzle Numerical Ability

A car travels half an hour at 40 km/h. How far does it travel.
a. 10 km
b. 20 km
c. 40 km
d. 80 km

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exam Other Question

solving equations containing parenthesis:

1. solve -[6x-(4x+8)]=9+(6x+3)

2. solve 4(x-2)+2(x+3)=6 Would you please help me with this problem?
Find the zeros of the polynomial function. If a zero is a multiple zero, state its multiplicity.
P(x)=2x^3-8x^2+7x+6.

Thank you for your help. I really appreciate it.