Fhedzisani mafhungombo. 725; 730; 735; 740; 745; 750 Tanganyani kana ni tuse thanu. I. Tanganyani thanu kha nomboro ye na newa. Ro dzula ro ni itela ya u thoma.

The sequence is $725; 730; 735; 740; 745; 750$.
Each number is obtained by adding 5 to the previous number ($730 - 725 = 5$).

The sequence is 800; 795; 790; \text{___}; \text{___}.
Each number is obtained by subtracting 5 from the previous number ($795 - 800 = -5$).
The next number is $790 - 5 = 785$.
The number after that is $785 - 5 = 780$.
The completed sequence is: $800; 795; 790; \boxed{\text{785}}; \boxed{\text{780}}$

Tanganyani kana ni tuse thanu (Add or subtract five)
The instruction is to add five to the given number.

• a) $760 + 5 = 765$
• b) $725 + 5 = 730$
• c) $780 + 5 = 785$
• d) $755 + 5 = 760$
• e) $715 + 5 = 720$
• f) $790 + 5 = 795$

The answers are:

a) $\boxed{\text{765}}$

b) $\boxed{\text{730}}$

c) $\boxed{\text{785}}$

d) $\boxed{\text{760}}$

e) $\boxed{\text{720}}$

f) $\boxed{\text{795}}$