Please help me on number 4

143degrees

Step-by-step explanation:

sum of angles of a triangle =180degrees

let the third unknown angle be x

99+37+x=180

136+x=180

x=180-136

x=44

the sum of two opposite interior angles is equal to the exterior angle

44+99=<PQR

<PQR=143 degrees.

OR

the sum of angles on a straight line is 180 degrees

<PQR+37=180

<PQR=180-37

<PQR=143

80x^8−68x^6+16^5−20x^4−4x^3+8x^2

hope i'm right lol