It takes 43 facial muscles to frown. This is 26 more muscles than it takes to smile. Write and solve an equation to find the number of muscles it takes to smile. (example: s + 1 = 4)

Number of facial muscles it takes to smile, S = 20

Step-by-step explanation:

Let

Number of facial muscles it takes to smile = S

Number of facial muscles it takes to frown, F = 46

This is 26 more muscles than it takes to smile

F = S + 26

46 = S + 26

Subtract 26 from both sides

46 - 26 = S + 26 - 26

20 = S

S = 20

The number of muscles it takes to smile is 20

the answer is the third / last answer

step-by-step explanation: