exam
Maths Puzzle
Numerical Ability
A cashier has 2 times as many nickels as quarters, 15 more dimes than quarters that worth $3.75 in total. Find how many dimes she has.
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exam Other Question
Line l goes throught the point (5,–2) and is perpendicular to the line through (–2, 1) and (–4, –2). Find the equation (in slope-intercept form) for l.
solve the system using matrices. Use Gaussian elimination with back-substitution or Gauss-Jordan elimination:
w+x+y+z=5
w+2x-y-2z=-1
w-3x-3y-z=-1
2w-x+2y-z=-2