exam Maths Puzzle Numerical Ability

solve 38.2multiply j=0.573

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exam Other Question

How do you do find the area of triangles with these points: (3,4)
(-1,3) and (6,-2) ? here is what i have tried.
[[341]
[-131]
[6-21]]. after that i get stuck. can you guys pl im having trouble understanding how they get get the answer i was hoping maybe you can help please

F=9C+32 find F if C =60 i dont see how they are getting F=180 i got
5
everything after that.
thankyou, Nicole