Answer:
the answer is Uwuuuuu sussyyy bAKKK UWUU
set it up like a y= equation.
which would be y=-x^2+7
to find the vertex, you substitute the 0s.
so 0=-(0)^2+7
-0^2=0
0+7=7
0=7
(0,7)
The two pieces are continuous for every 
So, our only concern is to make sure that the pieces "glue" continuously at x=7.
To ensure this, we evaluate both pieces at x=7, and impose that the two values are equal.
The first piece evaluates to

The second piece evaluates to

So, we want

We move all terms involving c to the left hand side, and all the numerical constants on the right hand side:

Answer:
m∠x = 119°
m∠y = 61°
m∠z = 119°
Step-by-step explanation:
Angle x:
- m∠x = 180° - 61° (sum of angles in a straight line)
- m∠x = 119°
Angle y:
- m∠y = 61° (Alternate interior angles)
Angle z:
- m∠z = 119° (Sum of angles in a line, corresponding angles)
-Chetan K