exam Maths Puzzle Numerical Ability

please help!!!

2z+14+18=6z+3

and

3x-2 over 3 - 5x+1 over 4 greater than equal to 0

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exam Other Question

The right circular cone has a volume = 24(pi=3.14)cubic cm and r = 3, What is the height? A BACTERIA CULTURE STARTED WITH A COUNT OF 480 AT 8:00 A.M. AND AFTER t HOURS IS EXPECTED TO GROW TO f(t)=480(3/2)t. ESTIMATE THE NUMBER OF BACTERIA IN THE CULTURE AT NOON THE SAME DAYS.