4. La quinta parte de los cuadros de una galería están en la planta baja; las tres octavas partes del resto en el primer piso y los 75 restantes en el segundo piso. ¿Cuántos cuadros tiene la galería?

\( \int \frac { d x } { \sqrt { 1 + e ^ { x } } } \)

Imagine you are the mayor of Vereeniging. The current population of Vereeniging is 70,000 people. You have received a report from the city's planning department that projects the population growth over the next five years. The report states that the population is expected to grow at a rate given by the function: \( r^{\prime}(t)=500\left(1+\frac{4 t}{27+t^{2}}\right), \quad(0 \leq t \leq 5) \) people/year, \( t \) years from now. As the mayor, you are responsible for ensuring that the city can accommodate this growth. You need to plan for additional housing, schools, healthcare facilities, and other infrastructure to support the increasing population. The current population is 70000 . What will be the population 5 years from now?

Determine the absolute value of the expression below. \( 2+i \)

Multiply \( 1+\sqrt{-3} \) by its complex conjugate.

1. \( -7 x+30=72 \)