A un estanque de agua en completa calma, se tira una piedra que provoca la formación de ondas circulares concéntricas, cada onda se aleja del centro a una velocidad de 20cm/seg¿con qué velocidad está aumentando la superficie total del agua perturbada al cabo de 8 seg?​

Write a recursive sequence that represents the sequence defined by the following explicit formula:

Svetlana's hair is 4 4 centimeters ( cm cm) long. her hair grows 1 . 5 cm 1.5cm per month. svetlana wants her hair to be less than 1 6 cm 16cm long. write an inequality to determine the number of months, m m, svetlana can allow her hair to grow so that it is less than 1 6 cm 16cm long.

If there is 20 dogs in the shelter and 5 dogs get homes, and then 43 more dogs come. how many dogs are there in the shelter?