Are these arithmetic, geometric, or neither? 1. -38, 162, 362, 562, 762

2. 2, 8, 32, 128, 512

3. 7, 2, -3, -8, -13

4. 1, 9, 25, 49, 81

m∠a is 90°

m∠b is 40°

$119.20

step-by-step explanation:

$372.50 - 60% off is $149. $149-20% off is $119.20

180°

step-by-step explanation:

sum of equilateral triangle=180°

< n=60°

< m=120°°[angle supplementary of equilateral angle]

< m+< r+< x=360°(sum of exterior angle of triangle)

is the anwser b. (-13)?