Please help (last question) Marking brainliest for the best and correct answer.

28.75 degrees

Step-by-step explanation:

The missing angle in the triangle and 120 add up to 180 so the missing angle must be 60 degrees

all the angles of the triangle add up to 180 degrees so

x + 3x + 5 + 60 = 180

4x = 180 - 65

4x = 115

x = 28.75

x = 28.75°

Step-by-step explanation:

First, you have to solve for the angle that is supplementary with 120°.

180° - 120° = 60°

The inside angles must add up to 180°, so the equation will be:

(3x+5)° + x° + 60° = 180° ––Now combine like terms (the x's)

(4x + 5)° + 60° = 180° ––Combine the like terms on the left (5 and 60)

4x° + 65° = 180° –– Get the x term all alone by subtracting 65 from both sides

4x° = 115° –– Divide both sides by 4 to get x by itself

x = 28.75°

Check by substituting:

[(3•28.75)+5]° + 28.75° + 60° = 180

(86.25 + 5)° + 28.75° + 60° = 180°

91.25° + 28.75° + 60° = 180°

120° + 60° = 180°

180° = 180°

This is correct.

b, i believe, but not sure.

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72