![\bf n^{th}\textit{ term of an arithmetic sequence}\\\\ a_n=a_1+(n-1)d\qquad \begin{cases} n=n^{th}\ term\\ a_1=\textit{first term's value}\\ d=\textit{common difference}\\ ----------\\ a_1=-7\\ d=0.5\\ n=8 \end{cases} \\\\\\ a_8=a_1+(8-1)d\implies a_8=-7+(8-1)(0.5)](https://tex.z-dn.net/?f=%5Cbf%20n%5E%7Bth%7D%5Ctextit%7B%20term%20of%20an%20arithmetic%20sequence%7D%5C%5C%5C%5C%0Aa_n%3Da_1%2B%28n-1%29d%5Cqquad%20%0A%5Cbegin%7Bcases%7D%0An%3Dn%5E%7Bth%7D%5C%20term%5C%5C%0Aa_1%3D%5Ctextit%7Bfirst%20term%27s%20value%7D%5C%5C%0Ad%3D%5Ctextit%7Bcommon%20difference%7D%5C%5C%0A----------%5C%5C%0Aa_1%3D-7%5C%5C%0Ad%3D0.5%5C%5C%0An%3D8%0A%5Cend%7Bcases%7D%0A%5C%5C%5C%5C%5C%5C%0Aa_8%3Da_1%2B%288-1%29d%5Cimplies%20a_8%3D-7%2B%288-1%29%280.5%29)
and surely you know how much that is.
Answer:
large jar
Step-by-step explanation:
large jar= £1.54 (divide) 440= 0.0035
small jar= £1.26 (divide) 340= 0.0037
as the large jar cost less (0.0035 > 0.0037) the large jar is the best value for money
Answer:
Step-by-step explanation:
The planet Mars is about 141.6 million miles away from the Sun. The speed of light is about 186,000 miles per second. It would take approximately 761 seconds (or 12 minutes and 41 seconds) for light to get from the Sun to Mars.
Hey! Add me! :) Im 13 btw.
anyways, how you solve this problem is simple:
first:distribute, which 3(x+2) turns into 3x+6
then:set 3x+6 equal to x-18
subtract x from both sides, then add 18 to -18 and 6,
the result of this is 2x=24
divide 24 by 2, you get 12 so x is equal to 12.
Good LUCK! :) rate mine the best c: lyy