Question

Evaluate the function f(x) = 2x – 2, when x = –1.a.45b.40c.35d.30

Answer 1

• x = 10.83

,

• ∡A = 65º

Step-by-step explanation

The sum of the measures of the interior angles of any triangle is 180º:

`\measuredangle A+\measuredangle B+\measuredangle C=180º`

Replacing with the angles we know (B and C):

`\measuredangle A+75º+40º=180º`

And solving for ∡A:

`\begin{gathered} \measuredangle A=180º-75º-40º \\ \measuredangle A=65º \end{gathered}`

Then we know that ∡A = 6x, so x is: