Assuming that t is an array and tptr is a pointer to that array, which expression refers to the address of element 3 of the array?

According to the basics of C++ syntax, &t[ 3 ] refers to the address of element 3 of the array given above. The array can be imagined like a box with some stuff. This stuff is the numbers which should be in "[ ... ]" with name of the array written before and "&".

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Hypothesis: volumes of both figures are equal.the volume of  figure 1 is: .the volume of figure 2 is: .since , you can conclude that and . so, .volumes of figures are equal only when an angle in the basis is right (then figures will be the same), in another cases volume of figure 1 is less than volume of figure 2.the hypothesis was not correct in all cases.