Tell whether each sequence is arithmetic. If the sequence is arithmetic, identify the common difference and find the indicated term.
18. -9, -4, 1, 6, 11, ...;a7=?
19. 2, 4, 7, 11, 16, 22, ...; a9= ?
20. -7,-1, 5, 11, 17,...; a6 = ?
21. 1.2, 1.9, 2.6, 3.3, 4.0, ...; a8 = ?
22. 3, 5/2,3/2,-3/2,;a7=?

PLEASE HURRRY THIS REALLY URGENT‼️ SOMEBODY HELP

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!

Given that s is the centroid of triangle mno, find sq.

The difference between the measures of two complementary angles is 14. find the measure of both angles.