Cada niño de una escuela recibe 10 frutas por semana, pero se retiran 20 niños ahora cada uno recibe 15 frutas por cada semana. ¿Cuántos niños eran en total al inicio?

What is the solution to the equation 9^(x+1) =27

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.