I think this is the answer ----> 8.7 (8.66 rounded)
first you turn the fractions into inproper fractions by multiplying the whole number by the denomonator and adding the numerator
4×4=16
16+3=19
19/4
4×7=28
28+1=29
29/7
keep the denomonators the same. now that you've converted them into inproper fractions you can multiply them
19/4 × 29/7=551/28
there is no way to simplify this answer so this is the final answer
3.888 :))))))))))))))))))))))))))
You probably mean either

or

Write 8 = 2³, so that in the first interpretation,

and in the second,

Then in the first interpretation, we have

Otherwise, the second interpretation gives
