what must students use when summarizing an informational text? check all that apply.a casual toneinformal languageacademic languagean objective, formal tonea variety of sentence types

The right answers are "A variety of sentence type ", "Academic language " and "An objective, formal tone ".

This will make the summary of the informational text more educated and formal, in that way, it can pass more credibility than the author of the abstract, get the text well and know how to use the words of your language.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).

i believe the answer is d