Answer:
480
Step-by-step explanation:
Sn = n÷2 × (2a + (n-1)d)
n = 20 a = -14 d = 4
S20 = 10 × (-28 + 19 × 4) = 480
It would be letter. b....
I think c .. I already took a course .. and the test had that question.. I cant remember the answer though
Answer:
21.8014094864
Step-by-step explanation:
tan(x)= 4/10
=0.4
inverse tan(0.4)
21.8014094864
3610.201 this the answer if u want in de imal
