Betty has a checking account and a non-interest bearing savings account. the function c(x), shown below, represents her checking account balance, where x is the number of months. the function s(x), shown below, represents her saving account balance. which function represents betty's total account balance, t(x)? t(x) = |240x + 140| + 450x + 1,500 t(x) = -|240x - 140| + 450x + 1,300 t(x) = -|240x - 140| + 450x + 1,500 t(x) = -|240x - 140| + 450x + 1,400