exam Maths Puzzle Numerical Ability

What property would you use to simplify (8.9 plus 2.4) plus 7.6?

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exam Other Question

Find the exact value of cos^-1(cos(4pi/3)).
apply the following translation to y=x^2
y=-(x-1)^2+5
a. sketch a graph by translating the original graph
b. describe the translation in words
c. give the mapping notation
d.