Answer:
b
Step-by-step explanation:
GCF of 9 and 21 = 3
9 + 21 =
3(3 + 7) <==
Answer:
a = 50°, b = 130°, c = 20°
Step-by-step explanation:
The sum of the 3 angles in a triangle = 180°
Sum the 3 angles in the right triangle
a + 40° + 90° = 180°
a + 130° = 180° ( subtract 130° from both sides )
a = 50°
a and b are adjacent angles and sum to 180° , so
a + b = 180°
50° + b = 180° ( subtract 50° from both sides )
b = 130°
Then sum the angles in the top triangle, that is
30° + 130° + c = 180°
160° + c = 180° ( subtract 160° from both sides )
c = 20°
8(8k+9) = 64k+72 , hope this helped :)
Answer:
Step-by-step explanation:
Mode is the number that appears most often in a set, so for this one the mode would be 3 since it appears the most often