Find the sum of the arithmetic sequence. -10,-7,-4,-1,2,5,8

example

Find the 21st term of: 2,8,14,20

a1=2

d=6

n=21

a21= 2+ (21-1)6

a21= 2+ (20)6

a21= 2+120

a21= 122

answer: solve 5\cdot 2^x=2405⋅2  

x

=2405, dot, 2, start superscript, x, end superscript, equals, 240.

solution

to solve for xxx, we must first isolate the exponential part. to do this, divide both sides by 555 as shown below. we do not multiply the 555 and the 222 as this goes against the order of operations!

\begin{aligned} 5\cdot 2^x& =240 2^x& =48 \\ \end{aligned}  

5⋅2  

x

2  

x

​    

=240

=48

​

step-by-step explanation:

m

step-by-step explanation: