La medida del suplemento de un ángulo es 5 veces la medida de su complemento. Halla la medida del ángulo.

Prove that 16^4-2^13-4^5 is divisible by 11.

Arational number that is equivalent to -20/4?

Study results indicate that the mean length of time people spend on a bus in a city is between 21.2 min and 24.5 min what is the study margin of the error?