Una persona se acerca a la presa con una barca y se para justo enfrente. Desde la altura de sus ojos hasta el agua hay 1,65 metros. Ve reflejada en el agua la parte más alta de la presa, a 2,06 m de su posición y a 5m de la presa. ¿Qué altura tiene la presa?

Find two numbers if their sum is 91 and the ratio is 6: 7?

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?

What are the domain and range of f(x)= -log5(x+2)