Q120 of 147 Page 8

What’s the Error? Ramu evaluated the expression –7 – (–3) and came up with the answer –10. What did Ramu do wrong?

Let us solve the expression for Ramu.

We have, -7 – (-3) = -7 + 3 [∵ minus & minuns = plus]


⇒ -7 – (-3) = -4 [∵ 7 is the greatest amongst 7 and 3, so the sign before 7 will be considered in the result]


The answer is coming out to be -4 while what Ramu did was add -7 and -3 and neglected a minus sign in-between -7 and -3.


More from this chapter

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119

Write two integers whose product is smaller than both the integers.

 119

Write two integers whose product is greater than both the integers.

 121

What’s the Error? Reeta evaluated – 4 + d for d = –6 and gave an answer of 2. What might Reeta have done wrong?

 122

The table given below shows the elevations relative to sea level of four locations.

Taking sea level as zero, answer the following questions:



A. Which location is closest to sea level?


B. Which location is farthest from sea level?


C. Arrange the locations from the least to the greatest elevation.