please help; English to French translation?

• people would protest :

- If you are just talking about people saying they disagree, it's "les gens protesteraient"

- If you are talking about people demonstrating in the street, it's "les gens iraient manifester"

• they should make school lunches cheaper for students :

Ils devraient rendre les repas scolaires moins cher.

Hi!

"on pourrait augmenter" shouldn't be left dangling by itself and needs a direct object, either a noun or a pronoun.

People would protest.

Here you need to conjugate "protester" in the "conditionnel présent", the conditional present tense at the 3rd person plural

http://www.conjuguetamere.com/verbe/protester

They should make school lunches cheaper for students

For this one, it's the verb "devoir" you need to conjugate in the conditional present tense at the 3rd person plural

http://www.conjuguetamere.com/verbe/devoir

Now that you've been given the tools, you can build your own house :)