Respuesta :

merue

Answer:

60

Step-by-step explanation:

m(ADB) + m(BDC) = 90°

(3x+9) + (2x -4) = 90°

5x + 5 = 90°

5x = 85

5x/5 = 85/5

x = 17

m(ADB) = 3x + 9

3.17 + 9 = 51 + 9 = 60

Hope this helps ^-^

MathTutors

Answer: 60°

Step-by-step explanation:

Looking at the figure, we know that the angles add up to 90°. We add both equations and solve for x.

3x+9+2x-4=90          [combine like terms]

5x+5=90                    [subtract both sides by 5]

5x=85                        [divide both sides by 5]

x=17

Now that we know x, we can plug it into ADB to find the angle.

3(17)+9                      [multiply]

51+9                          [add]

60

Now, we know that ADB is 60°.

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