$3.60 for 2 cups would be $1.80 for one cup.
$3.60 for 2
$5.40 for 3
$7.20 for 4
$9 for 5
$10.80 for 6
$12.60 for 7
$14.40 for 8
The answer is 15.525. All you have to do is divide 279.45 by 18 which gives you 15.525.
Answer:
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A40=a1 +(40-1)r
in this case r is 3 beceause -2+3 will be 1 etc
a40=-2 +39*3
