certain two digits number is equal to five times the sum of its digits. If 9 were added to the number, its digits would be reversed. Find the numbers, and the sum of the numbers? [15]

Find the position and velocity of an object moving along a straight line with the given acceleration, initial velocity, and initial position. \( \mathrm{s}(\mathrm{t})=\square \) \( \mathrm{s}(\mathrm{t})=\square \)

\( ( \frac { 1 } { 2 } ) ^ { 6 } \cdot ( \frac { 1 } { 2 } ) : [ ( \frac { 1 } { 2 } ) ^ { 2 } ] ^ { 3 } - \frac { 1 } { 2 } \quad \{ [ ( \frac { 3 } { 4 } ) ^ { 2 } ] ^ { 3 } \} ^ { 4 } \)

Realizar las integrales de forma correcta. \( \int 1 / 9 x^{-4 / 8}-4 / 7 x^{-2 / 5}+1 / 3 x^{-8 / 3} \) \( \int 3 x^{5 / 9}+8 x^{4 / 7}-9 x^{2 / 7}+4 x^{2 / 9} \) \( \int \frac{-1}{7 x^{-7 / 3}}+\frac{4}{7 x^{-2 / 5}}-\frac{8}{2 x^{-4 / 7}} \) \( \int 4 x^{-1 / 7}+8 x^{-2 / 5}+10 x^{-2 / 3}+8 x^{-7 / 6} \) \( \int \frac{3}{7 x^{-8 / 9}}+\frac{7}{6 x^{-1 / 8}}+\frac{5}{9 x^{-2 / 6}}+\frac{4}{7 x^{-2 / 9}} \)

Exercices 19 à 21 Simplifier les expressions et les écrire sous la forme d'un produit de puissances de nombres premiers. \( A=\frac{27^{2} \times 45^{-3}}{25^{-2} \times 12^{2}} \quad B=\frac{10^{2} \times 18^{3}}{15^{3} \times 12^{2}} \) \( C=\frac{5,1^{2} \times 1,25 \times 10^{3}}{85^{2} \times 3,6} \)

B. \( 3 x-4>x \)