Please answer correctly and no links

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom

An unknown number x is at most 10. which graph best represents all the values of x? number line graph with closed circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the left. number line graph with closed circle on 10 and shading to the left.

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25