What is the standard deviation for percent of children under five considered to be underweight?

Which expression is equivalent to 2^4y^3

In a school 2/3 of the students study a language of those who study a language 2/5 study french

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?