Brainiest to whenever correct!

Step-by-step explanation:

add them all up to equal it to 540

72 + 89 + 99 + 4x + 3x = 540

260 + 7x = 540

7x = 280

x = 40

x = 40

Step-by-step explanation:

to find how many degrees a polygon has in total you can use the formula (s - 2) * 180 in which s means sides

there are 5 angles in this polygon so we can do (5 - 2) * 180

3 * 180 is 540 so this shape has 540 degrees in total

so when adding them together they should equal 540

72 + 3x + 4x + 89 + 99 = 540

then you combine like terms

7x + 260 = 540

and subtract

7x = 280

last divide

x = 40

that is your answer