What is the unit of time most often used by scientists?

Me find the missing dimension of a triangle height: 7 in., area: 21^2

Can you answer my question? will mark brainiest!

An alien has just landed from the planet, iksnimak. he would like to leam how to add two fractions when thedenominators are the same. write a paragraph that explains to our alien friend, in your own words, the detailsabout how to add the fractions, how to change the result to a mixed number, and how to reduce the fractionpart. use this problem as your example: the two fractions are 5/8 & 7/8