exam Maths Puzzle Numerical Ability

Find the value of c that completes the square.
y to the second power - 3y+ c

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exam Other Question

Find the point of intersection for the following lines:

2x+y=13

and

x-y+2 Can someone help solve this?
Let H(t)=4+4sin(pi t/2). Approximate to the nearest hundredth
all values t in the interval [0,4 pi] for which Ht=6.