Anybody know the answer to this

1)  

2)

3) x=30

4) x= -4/3

Step-by-step explanation:

Use the Pythagorean theorem to find the missing angle.

In the formula, the c is the length of hypotenuse, so

20*9=6x

180=6x

x=30

4(3x+2)=6x

12x+8=6x

6x=-8

x= -4/3

1) is right

step-by-step explanation:

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!