Answer :

It's 8.25. Do you need an explanation too?
[tex]1 \frac{3}{4} - \frac{7}{10} [/tex]

[tex]1.75 - 0.7 =1.05 [/tex]

1.05, or 21/20

More detailed:

[tex]1 \frac{3}{4} = 1.75 7/10 = 0.7 1.75 - 0.7 = 1.05[/tex]