Everyone in andy's class has to do a science project. out of the 20 students, 80% have completed their projects. how many students still needs to finish their projects a.100 students b.36 students c.16 students d.4 students

Ithink i know it but i want to be sure so can you me out ?

Use pascal's triangle to find the missing values. x4 - 4xb + 6x2 - ax + 1

Afitness center has 2 membership plans one has a low dollar sign up fee of 15 dollars and costs 38 dollars per month to join. a second plan has a higher sign up fee of 78 dollars but a lower monthly fee of 31 dollars for what number of days of the month is the coat the same