An arithmetic sequence is defined by the recursive formula t1=9,tn -1 where n en and n > 1. The sequence is A) -9, 13.-17, -21.-25.-29.
B) -9,-4-8, 12, 16, 20,...
C) 9.-4, -8-12. -16, -20..
D) 9.5, 1.-3.-7, -11,

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.

14

step-by-step explanation:

14

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x