A) write an equation
B) x=
Picture is above

Answer is in the steps

Step-by-step explanation:

The interior angles of a triangle add up to one 180 degrees so they all have to add up to 180 degrees.

A)  (x+10)° + 50° + (x+20)° = 180°

B) Now solve for x  using the equation

   x+10 + 50 +x+20= 180  

    2x + 80 = 180

            -80   -80

2x = 100  

x = 50    

option a, c,d are correct.

step-by-step explanation:

from the given figure, it is given that z is equidistant from the sides of the triangle rst, then from triangle tzb and triangle szb, we have

tz=sz(given)

bz=zb(common)

therefore, by rhs rule,δtzb ≅δszb

by cpctc, sz≅tz

also, from δctz and δasz,

tz=sz(given)

∠tcz=∠saz(90°)

by rhs rule, δctz ≅ δasz, therefore by cpctc, ∠ctz≅∠asz

also,from δasz and δzsb,

zs=sz(common)

∠zbs=∠saz=90°

by rhs rule, δasz ≅δzsb, therefore, by cpctc, ∠asz≅∠zsb

hence, option a, c,d are correct.

is means division by fractions

step-by-step explanation: