Simplify the expression. \( -19+\left(\frac{-4.5+6.87}{3}\right) \cdot 5^{2}-7.3 \)

The value of \( \sqrt{10+\sqrt{25+\sqrt{108+\sqrt{154+\sqrt{225}}}}} \) is

The absolute value of a real number \( x \) is represented by:

Anastasia chooses a 4-digit number. The digits are all odd. The digits are all different. Her number rounds to 1500 when rounded to the nearest 100 Write the largest number that Anastasia could choose.

3. Primi e perfetti a. Qui di seguito sono riportati alcuni numeri scomposti in fattori primi. Quali tra essi sono quadrati perfetti? Motiva la risposta. \( \begin{array}{ll}192=2^{6} \times 3 & \text { (si) (NO) } \\ 484=2^{2} \times 11^{2} & \text { (si) (NO } \\ 200=2^{3} \times 5^{2} & \text { (i) (NO } \\ 144=2^{4} \times 3^{2} & \text { (si) (NO) }\end{array} \)

25. Expresa en la forma radical \( y \) halla el resultado Potencia con exponente fraccionario \( \begin{array}{lll}\text { a) } 64^{\frac{1}{2}} & \text { b) }(-125)^{-\frac{1}{3}} & \text { c) }\left(256 x^{3} y^{2}\right)^{\frac{4}{7}}\end{array} \)