Respuesta :

mnoz
x= 8

90= 10x+10

subtract 10 from each side

80=10x

x=8
MotherRhea

Answer:

x=8

Step-by-step explanation:

Each of the angles in a rectangle equal 90, so you would set 10x+10 equal to 90.

10x+10=90

10x=80

x=8

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