Amber could have used cross multiplication.
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Answer by JKismyhusbandbae: 6n-16
Arithmetic Formula: ![a^n=-10+6\left(n-1\right)](https://tex.z-dn.net/?f=a%5En%3D-10%2B6%5Cleft%28n-1%5Cright%29)
Use the following formula to determine any number in an arithmetic sequence:
an = a1 + d (n – 1)
a1 = the first term.
d = common difference
n = term number
If you do a check (plug in your answer to y) that would be your reason
Answer:
<em>Getting 21 ounces for $6.49 is a better deal!</em>
Step-by-step explanation:
4.99 / 12.4 = 0.402419...
6.49 / 21 = 0.30904...
0.4 is larger than 0.30 therefore 0.30 is less and a better deal.
Have an amazing day! ^-^