Which expression has odd numbers for all of its coefficients? A
2m+7n+1

B
3x+6y

C
4x+5

D
5a+3b+4

Option D is correct

Step-by-step explanation:

This is because 5 and 3 are odd numbers and a coefficient is a number next to a variable and both of those coefficients in Option D are odd. Therefore, Option D is correct.

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