Hey there,
Your question states: <span>How did the calculation of pi help mathematicians during the Gupta period?
My best guess that I would give would be the option B. </span><span>
The value of pi helped them explain that Earth is a rotating sphere. Because they used the </span>

to help them, just as we use that in math.
Hope this helps.
~Jurgen
Possibly more trades could take place around the world
Answer:
D) the value of the services of the real estate agent
Explanation:
Real estate are not included in the calculation of GDP. However, their related services such as the services of an agent is included in GDP calculation.
Answer:
A) tests with a non-pathological focus
Explanation:
All tests mentioned above are not used to diagnose mental disability or any pathological disease. The test focused more to quantify a certain characteristic that makes up personality. Many of the psychological tests is controversial since personality is a complex things. Putting personality into few categories based on binary characteristic often make it inaccurate.
Many businesses want to use the tools to aid in hiring people that better suited for the job, but it's should not be intended that way. In spite of that, if used properly this test can help someone to know themself better.