PLS HELP THIS IS A TEST Which number satisfies the inequality below?

1.75x + 4.50 < 20

a: 13
b: 14
c: 9
d: 7

Plz heeeeeeelp plz give me the answer

Guys i really need or i have to stay late up night

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders