Q70: Let <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6988/.jpg" alt="Let Find
Q71: Use Lagrange multipliers to find the maximum
Q72: (x<sup>2</sup> + y<sup>2</sup> + z<sup>2</sup>)<sup>5</sup> = -23.
Q73: Let <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6988/.jpg" alt="Let ;
Q74: Determine whether the function <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6988/.jpg" alt="Determine
Q76: Let <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6988/.jpg" alt="Let .
Q77: Let <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6988/.jpg" alt="Let .
Q78: Find <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6988/.jpg" alt="Find and
Q79: What is/are the domain restriction(s) for
Q80: Let <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6988/.jpg" alt="Let .