Acell phone company charges $40 per month for unlimited calling and $0.20 per text message sent it to you represents the number of text messages rocky sent last month which expression represents the cost of her bill last month before any taxes or additional fees

The expression would be $0.20 x f. Once you figure out what the 'f' variable stands for, you have to multiply it by $0.20, and you will have your answer.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands