A certain radioactive substance has a half-life of 10 years. If you start with 80 grams, how much will remain after 30 years?

Natalia ahorra \( \frac{2}{6} \) partes de su sueldo para comprar una cámara fotográfica. Si lo que ahorra representa \( \$ 1200 \), ¿cuál es el total de su sueldo?

- Show trat \( \sqrt{11} \) is an irrational numbers - Shom that \( \sqrt{7} \) is an irrational numbers

66. When Mahlet counts oranges in a basket by 5's, there are 3 oranges left over, when she counts them by 3's, there are two left over. What is the least number of oranges in the basket?

\( f(x)=\sqrt{x+5} \) is \( R \) except -5

Perché la funzione \( y=\frac{x}{3} \) ha come dominio naturale \( \mathbb{R} \), mentre \( y=\frac{3}{x} \) no?