The answer would be -2x^4y^6. first make a fraction with it then divide the coefficients and subtract the exponents, the difference of the exponents will go where the bigger number was.
The two angles given are two angles of a triangle, so the third angle must be:
SPR=180-RSP-PRS
SPR=66°
99.....the killer only killed one but i feel this is a riddle that i dont get lol