Why is it important to write any zero in the correct place value proposition when using the break apart strategy to add?

Will give brainliest sum of arithmetic series (sigma notation) find the numerical answer to the summation given below. (image shown below)

5/6+7/8what is the answer sealsdbdbshd

Apatient is to be given 35 milligrams of demerol every 4 hours. you have demerol 50 milligrams/milliliter in stock. how many milliliters should be given per dose?