let's recall that the sum of all interior angles in a triangle is 180°, so then

Answer:
<h2>It's a reflection across the x-axis.</h2>
Step-by-step explanation:
(x, y) → (x, -y)
It's a reflection across the x-axis.
<em>The reflection of the point (x,y) across the x-axis is the point (x,-y).</em>
Answer:

Step-by-step explanation:
Step 1;
Write expression




What you want to do, is isolate the y by itself to rewrite the equation as y=mx+b. So when you move the 5x over the equation looks like this -6y=-5x+30. Then you divide the -5x+30 by -6 to isolate the y. Thus making the equation y=5/6x-5. And since there is only one answer with the y-intercept as (0,-5); The answer is A.
The next 3 numbers to be highlighted would be 90, 99, and 108.
multiples of 9 is like take 1 times 9 and 2 times 9 and etc.
or you can just keep adding on 9 from the previous number like 81 + 9= 90