Answer:
a = -27
d = -21 - ( -27) => 6
a62 => a + 61 (d) +=> -27 + 61(6)
=> -27 + 366
=> 339
Answer:

Step-by-step explanation:
B)10+5(8)+2(12)=74
10+40+24=74
22.) True, quadrilaterals are essentially 4-sided figures
24.)True, as long as diagonals are orthogonal