Question

What is the answer plz ?

Answer 1

18°

Step-by-step explanation:

Remember this:

All angles inside a triangle sum up to 180°.

So in your case:

∠A + ∠B + ∠C = 180°

Now you need to solve for ∠A, but you need to know what x is first. So we solve for it by plugging in the expressions into one equation. Let's start with what is given:

∠A = x -22

∠B = 3x + 19

∠C = x - 17

So we plug use the given and put it into our first equation so we can solve for x:

∠A + ∠B + ∠C = 180°

(x - 22) + (3x + 19) + (x - 17) = 180°

`(x - 22) + (3x + 19) + (x - 17) = 180\\\\ Combine\;like\;terms\\\\5x - 20 = 180\\\\Add\;20\;to\;both\;sides\;of\;the\;equation\\\\5x - 20 + 20 = 180 + 20\\\\5x = 200\\\\Divide\;both\;sides\;by\;5\\\\(5x)/(5)=(200)/(5)\\\\x = 40`

Now that we know that x = 40, we substitute that into the equation of ∠A.

∠A = x -22

∠A = 40 -22

∠A = 18°