Tony cycles for 3 h 15 min at an average speed of \( 12 \mathrm{~km} / \mathrm{h} \) and covers only \( \frac{3}{7} \) of his journey. How far more has he got to cycle to complete his journey?

3) Find the value of \( x+y \) if \( 15 x+17 y=21 \) and \( 17 x+15 y=11 \)

Which is an equivalent expression for \( \left(\left(\frac{4}{7}\right)^{2} \cdot\left(\frac{2}{3}\right)^{-3}\right)^{-1} \)

State the number of complex zeros, the possible number of real and imaginary zeros, the possible number of positive and negative zeros, and the possible rational zeros for each function. Then find all zeros. \( f(x)=3 x^{5}+9 x^{4}+17 x^{3}+51 x^{2}-6 x-18 \)

a. Titus fick resultaten 7,7 och 10 proven.

1). Convestir \( \cdot \frac{\pi}{9} \cdot 28^{\circ} \)