Three friends are buying seashells at the gift shop on the beach. melanie buys 2 seashells for $0.80. rosi buys 5 seashells for $2.00. carlos buys 4 seashells for $1.60. use a graph to determine whether the number of seashells and the cost have a proportional relationship if so what is the constant of proportionality and what does it mean?

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐

the answer would be c:   ax + b = ax + c

step-by-step explanation:

the easiest way to do these would be to solve the equations. if you can solve the equation than you can solve these problems.