Step-by-step explanation:
the sum of all angles in a triangle is always (ALWAYS !) 180°.
180 = 31 + 35 + x = 66 + x
x = 180 - 66 = 114°
Answer: k = -5
explanation-
distribute: -3k + -21 - 5k + 4= 23
combine: -8k -17 = 23
add 17 to both sides: -8k = 40
divide both sides by -8: k=-5
Answer:
x^3+3x^2+9x+27
Step-by-step explanation:

_____
The factoring of the difference of squares is used (twice):
a² -b² = (a -b)(a +b)
Answer:
180:270:720
Step-by-step explanation:
total units-> 13u
1 unit -> 1170÷13=90
2u->90×2=180
3u->90×3=270
8u->90×8=720
i could give you many
30 + 0.6
15.3 + 15.3
20 + 10.6
that's just 3 but if you need anymore let me know