Using the correct symbols, we have:
Given expression = 8 / 6 - 4 * 3 + 4
= 4 / 3 - 4 * 3 + 4
= 4 / 3 - 12 + 4
= - 20 / 3

Using the correct symbols, we have :
Given expression = 40 + 12 / 3 * 6 - 60
= 40 + 4 * 6 - 60
= 40 + 24 - 60
= 4

Using the correct symbols, we have:
Given expression = 4 * 11 - 5 + 55
= 44 - 5 + 55
= 94

Using the correct symbols, we have:
Given expression = (3 * 15 + 19) / 8 - 6
= (45 + 19) / 8 - 6
= 64 / 8 - 6
= 8 - 6 = 2

The 1^st, 4^th, 8^th and 9^th letters of the given word as E, C, O and N. The word that can be formed is CONE.

All the given terms are three successive elements of the sequence, except 4GB.

The 2^nd, 5,^th, 8^th and 10^th letters of the given word are E, L, M, N.No word can be formed using the letters.

The 4^th element to the right of the 23^rd element from the right end is = 23 - 4 = 19^th from the right end which is 'Q'

The given word is:E    Q    U    I    T    YThe letters of the word in reverse alphabetical order:Y    U    T    Q    I    ENO letter remains in the same position.

Using the correct symbols, we have:
Given expression = 8 + 7 * 8 / 40 - 2
1
= 8 + 7 * - - 2
5
= 37
-
5
2
= 7 -
5