The 1st, 4th, and 7th terms make an arithmetic sequence of their own. The 4th term is the average of the 1st and 7th, so ...
(1st +7th)/2 = 4th
1st + 7th = 2×4th
1st = 2×4th - 7th
The first term is ...
2*141 - 132 = 150
Answer:
Step-by-step explanation:
3y+6+4y-7=-8
7y-1=-8
7y=-8+1
y=-7/7
y=-1
Answer:
21.66.
Step-by-step explanation:
First convert to improper fractions:
= 55/2 x 192/3 / 325/4
= 10560/6 / 325 / 4
= 10560/ 6 x 4/325
= 10560/ 3 * 2/325
= 21120/ 975
= 21.66.