book Maths Puzzle Numerical Ability

perform indicated operations and simplify
1. (x-4)cubed

2. (x(a)-1)(x(a)+1)

3.2y(2)+6/y(2)-y times y(2)-y(3)/4-8y

4.9xy(3)/7x(2)y divided by 2x(2)y(2)/ 3x(4)

systems o

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book Other Question

The table gives the outside temperature in degrees Fahrenheit on a winter day in Death Valley, California.

Time (A.M.) 7:00 8:00 9:00 10:00 11:00
Temp. 78 82
Restar a-b de b-a
x-y de 2x+3y
-5a+b de -7a+5