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What is the average of odd numbers from 1 to 40?

If the area of a triangle with base x is equal to the area of a square with side x, then the altitude of the triangle is-

If the radius of a circle is reduced by 40%, its circumference is reduced by-

The complement of an angle exceeds the angle by 60°. Then the angle is equal to -

If in

$\[ \Delta ABC, \quad AB = 6 \, \text{cm}, \quad BC = 12 \, \text{cm} \quad \text{and} \quad CA = 6\sqrt{3} \, \text{cm} \]$

, then the measure of

$\text{Given } x + \frac{1}{x} = 2, \text{ we need to find } x^3 + \frac{1}{x^3}.$

An investor earns 3% return on

$\text{Given } x + \frac{1}{x} = 2, \text{ we need to find } x^3 + \frac{1}{x^3}.$

of his capital, 5% on

$\text{Given } x + \frac{1}{x} = 2, \text{ we need to find } x^3 + \frac{1}{x^3}.$

and 11% on the reminder. What is the average rate of return he earns on his total capital?

If x is an integer, then which of the following statements about $x^2 - x - 1$ is true?