x and y, given correct to 2 decimal places, are 3.57 and 3.42 respectively. What is the upper bound of \(x + y\)?
7
When a number is given correct to 2 decimal places, its actual value lies between (value − 0.005) and (value + 0.005). So x's upper bound = 3.575 and y's upper bound = 3.425. Maximum x + y = 3.575 + 3.425 = 7.000. Hence the upper bound of x + y is 7, matching option 2.
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