ANSWERS
(a) milliliters
(b) grams
(c) centimeters
Step-by-step explanation
To answer all of these questions, we have to think about each situation.
(a) In this case, Tammy added cream to her coffee. Unless she is drinking more than 5 liters of coffee, she cannot be adding 5 liters of cream. Therefore, she added 5 milliliters of cream to her coffee.
(b) Here we are talking about the mass of a cellular phone. The size of a cell phone is just big enough to fit in a person's hand and, usually, its weight is designed to be held with one hand. Therefore, if the number is 100, that cannot be 100 kilograms.
Hence, the mass of the cell phone is about 100 grams.
(c) Now we have a pencil and we are talking about its length. Like in the case of the cell phone, a pencil is something we hold with one hand, so it cannot be 19 meters long - and 19 kilometers would not fit in our hands either. So, we have either millimeters or centimeters.
19 millimeters is about the size of the tip of a pencil - the part in the shape of a cone, so 19 millimeters is too short of a pencil. Hence, we can conclude that the length of a new pencil is about 19 centimeters.