The question will always tell you what the symbols means. Read the question carefully and then plug in the numbers.
What is the value of
Step 1: Plug in
Step 2: Plug in x = 4
Step 3: Add the two
If , what is the value of k?
Step 1: Plug in x = 4 and y = 5
Step 2: Plug in x = k and y = 10
Step 3: Equate the two
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