exam Maths Puzzle Numerical Ability

determine the perpindicular distance between
a. the parellel planes: x+2y+3z+6=0 and x+2y+3z-6=0

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exam Other Question

In the parking lot at a truck stop there were 6 more cars than 18 wheels trucks. There were 134 wheels in the parking lot. How many cars and trucks were there? determine whether the graph of the polynomial has y-axis symmetry, origin symmetry or neither
f(x)=7-x^4