Как решить задачу 6 (а) стр.169 по математике 4 класс 1 часть книги

Is every rectangle is a parallelogram? true false

What is the sum of these mixed numbers 2 1/8 + 4 3/8

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.