For sake of convenience, reverse the series, then it would be:
21,19,17.....7
a=21, d = -2,
s(4) = 4/2 (21+15)
s(4)=2(36)
s(4) = 72
5+b>15 if you need the expression here it is
Answer:
In standard index form a number is written firstly with a sign (if negative) followed ... by a power1 of 10. Powers of 10. Non-negative powers of 10. 100. 1. 101. 10.
Step-by-step explanation:i hope it helps
Answer:
Yes
Step-by-step explanation:
Roberto 4:6 = 2:3
divisor 2. 4/2=2 6/2=3
Casey 6:9 = 2:3
divisor 3
6/3=2 9/3=3
