31. If Snı = 1 + 2 + 3 + + n = 20, then Sn2 = 1^2 + 2^2 + 3^2 + + n^2=
a. 400
c. 375
b. 250
d. 200​

Which of the following tables represents exponential functions?

Big boi and travis scott are performing at the super bowl. travis scott is 62 years younger than twice big boi’s age. the sum of their ages is 70 years old. use b to represent big boi’s age. write and solve an equation.

Aconstruction worker has rope 9 m long he needs to cut it in pieces that are each 3 /5 m long how many such pieces can he cut without having any rope leftover?