Instructions: Write the recursive rule. Sequence: 21,−9,−39,−69,… 21 , − 9 , − 39 , − 69 , … =−1 a n = a n − 1 Answer Answer 1= a 1 = Answer

answer: 8

step-by-step explanation:

-x represents miles per gallon

-y represents cargo weight

-vehicle traveled an average of 5.3 miles per gallon(x1) with load of 22 tons (y1)

- vehicle traveled an average of 6.3 miles per gallon( x2) with load of 18 tons( y2)

so, equation now becomes

so, option a) is correct