exam Maths Puzzle Numerical Ability

solve the equation:

sq rt of 3x+1 +2 =4

i am so conufesed please help
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exam Other Question

each pair of points lie in a line with a given slope. find x.
(4,3), (x,7) slope=2
how would you complete this?? One pump can fill a water tank in 3h (hours), and another pump takes 5h. When the tank was empty, both pumps were turned on for 30 minutes and then the faster pump was turned off. How much longer did the slower pump have to run before the tank was filled?