The 4th term of an AP is 6. If the sum of the 8th and 9th terms is -72, the com. mon difference is:
1 answer:
Answer:
t(4) = 6 ---- a + 3d = 6
t(8) + t(9) = -72
a+7d + a+8d = -72
2a + 15d = -72
double the first equation
2a + 6d = 12
subtract them
9d = -84
d = -84/9 = -28/3
Step-by-step explanation:
You might be interested in
Total: 318
Student tickets: x
Adult tickets: 3x+6
x+(3x+6)=318 -> 4x+6=318 -> 4x=312 -> x=78
3(78)+6 = 234+6 = 240
240 adult tickets were sold
Answer:
7
Step-by-step explanation:
Answer: 1B. 2C 3E 4D 5E
Step-by-step explanation:
Answer:
2:10
Step-by-step explanation:
3.5 strip As will fit into Strip b. 2/7 strip Bs will fit into strip A
