Can somebody help me pls I really don’t know what I em doing

20points

DCB = 78°

Step-by-step explanation:

A straight line is 180° so the angles ACD and DCB must add up to 180° so: 4x+2+3x+3=180

From here it's normal algebra, add like terms so it will be 7x+5=180

subtract 5 from both sides so it will be 7x=175

Divide both sides by 7 so we will get X=25 but we aren't done yet! We need to substitute the value of X into the angle DCB so we can get the real value so:

3(25)+3=78

Hope I helped!

simplifying

5(x + -6) = 2(x + 3)

reorder the terms:

5(-6 + x) = 2(x + 3)

(-6 * 5 + x * 5) = 2(x + 3)

(-30 + 5x) = 2(x + 3)

reorder the terms:

-30 + 5x = 2(3 + x)

-30 + 5x = (3 * 2 + x * 2)

-30 + 5x = (6 + 2x)

solving

-30 + 5x = 6 + 2x

solving for variable 'x'.

move all terms containing x to the left, all other terms to the right.

add '-2x' to each side of the equation.

-30 + 5x + -2x = 6 + 2x + -2x

combine like terms: 5x + -2x = 3x

-30 + 3x = 6 + 2x + -2x

combine like terms: 2x + -2x = 0

-30 + 3x = 6 + 0

-30 + 3x = 6

add '30' to each side of the equation.

-30 + 30 + 3x = 6 + 30

combine like terms: -30 + 30 = 0

0 + 3x = 6 + 30

3x = 6 + 30

combine like terms: 6 + 30 = 36

3x = 36

divide each side by '3'.

x = 12

simplifying

x = 12

this should .

the answer to your question is c.)   volcanoes built the mountains and earthquakes tore them down.

step-by-step explanation: