exam Maths Puzzle Numerical Ability

Direct

Problem #3

Simplify

(sqrt(20))/(5) minus (1)/(sqrt (5))

Problem #4
Simplify

sqrt ((7)/(100))

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exam Other Question

Hi, can you please help me solve this problem.

sketch the graph of: y= /x-2/ -2

the backslashes represent the absolute lines. The sum of twho numbers is 89. Adding four times the first number to the second number gives 155. WHich one of the follwoing equaitons expresses this problem algebraically?