Charlotte rides the bus 8 minutes every day. Let \( d \) represent the number of days and \( m \) represent the total number of minutes Charlotte spends on the bus. Use the function \( m=8 d \) to find the value of \( m \) when \( d=4 \). \( m=\square \)

5. In un rettangolo un lato misura 1 unità più dell'altro. Detta \( x \) la misura del lato minore, esprimi, in funzione di \( \left[A(x)=x^{2}+x+\frac{1}{4}\right] \)

\( 2 ( x + 5 ) \cdot 7 = 3 ( x - 2 ) \quad \{ x - 3 , x = 3 , x = 1 \)

The ratio between the sum of the fifth, sixth and seventh terms of a geometric series and the sum of the first three terms of the same series is \( 81: 16 \). Determine the sum of the first ten terms, if the first term is 1024 .

7. Show that the set F of the six complex valued functions: \( f_{1}(z)=z, f_{2}(z)=\frac{1}{1-z}, f_{3}(z)=\frac{z-1}{z} \) \( f_{4}(z)=\frac{1}{z}, f_{5}(z)=1-z, f_{6}(z)=\frac{z}{z-1} \) is a group under the usual multiplication of mappings.

\( 6 x^{3}-5 x^{7}+6 \) leading term? Leading cafficient? Turning Caint?