book Maths Puzzle Numerical Ability

how do you change 3 5/8 into a improper fraction? Stuck on homework thanks

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please help it say use the substitution method to solve the linear system

x+2y=-5
4x-3y=2


32-2y=4
x+ 3y=5


3x+y= -2
x+3y=2
question is: f(x)=2x^2-x-1

List the y-intercept, if there is one, of the graph of f(x).