exam Maths Puzzle Numerical Ability

i don't get how to do it

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exam Other Question

25 team members shake hands. how many handshakes take place?hint look at the pattern people = 2,3,4,5 handshakes= 1,3,6,10 can you please help? What is the y-intercept of y = 1/2x + b if it passes through (-8,-4)?

a. m=0
b. b=0
c. b=-4
d. Insufficient information given