Question

The missing angle of (3x-5)

Answer 1

Answer: 22

Step-by-step explanation:

(7x+5) + (3x-5) + 90 = 180

10x + 90 =180

        -90   -90

10x          =90

_               _

10             10

x = 9  

3(9)-5

27-5

22

Answer 2

Answer:

To find the missing angles of the triangle we must first make an equation using what we know. A triangles sum is equal to 180 degrees, and a box indicator represents a 90 degree angle. With that we do this,

(7x+5)+(3x-5)+90=180
7x+5+3x-5+90=180
7x+3x+90=180
10x+90=180
10x=180-90
10x=90
10x/10=90/10
x=9

Now we find each individual missing angle,

(3x-5)
3(9)-5
27-5
22 degrees

(7x+5)
7(9)+5
63+5
68 degrees

Check to make sure it equals 180 degrees

22+68+90=180