Cuanto es el 30% de 100

Enemos que seguir estas reglas salvar el medio ambiente. a. para entonces b. por c. para d. por eso

Okay so i'm taking an online spanish course (penn foster), and in the study guide, you have to create a bunch of sentences with words you've learned so far. translating, reading, and those kinds of things are fairly easy, but when it comes to making my own sentences, my brain just kinda waltz's away. anyone got any tips?

Brainliest.if you answer number 2, 3,and 4. ill give brainliest. dont answer just for brainliest.picture is above.