S K Gupta and Anubhuti Gangal Solutions for Exercise 3: Chapter Assessment

During a week in the month of January, a place in the Himalayan region recorded the temperatures: $-3°\mathrm{C},-6°\mathrm{C}, 2°\mathrm{C}, 0°\mathrm{C},-4°\mathrm{C}, 1{}^{\circ }\mathrm{C}$ and $-8°\mathrm{C}.$ Find the difference between the highest and the lowest temperatures during the week. 

Which expression has the value $-19?$

If $*$ is an operation on integers such that for integers $a$ and  $b, a*b=a-b-(-3),$ then what is $2 *(-5)$ equal to?

During maneuvers on a space walk, an astronauts' pulse rate first rose $48$ beats per minute, then fell $15$ beats per minute, rose $32$ beats per minute and after the astronauts' return to the capsule fell $50$ beats per minute. What is the net change in his pulse rate?

Find two integers whose sum is $2$ and difference is $8$.

The Indus Valley civilization began around $2800 \mathrm{BC}$ and lasted for $900$ years. About what year did the Indus Valley civilization end?
 

The Ancient period of Indian History started around $500 \mathrm{BC}$ and lasted for around $1050$ years. About what year did the Ancient period end?
 

The Indus Valley civilization began around $2800 \mathrm{BC}$ and lasted for $900$ years. The Ancient period of Indian History started around $500 \mathrm{BC}$ and lasted for around $1050$ years. About how many years after the Indus Valley civilization ended, did the Ancient period end?