book Maths Puzzle Numerical Ability

FORMULA FOR CALCULATING PERCNTAGE DIFFERENCES OF 1 AMOUNT TO ANOTHER.
SUCH AS $6.00IS WHAT PERCENTAGE OF $5.80?

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book Other Question

Find det A, given A = [-1 0 1
2-1 3
0 1 5]
solve the equation graphically if possible.
x=4+y
y=3+x
thank you
kayla