Answer:
79
Step-by-step explanation:
Answer:
Tn = 64-4n
Step-by-step explanation:
The nth term of an AP is expressed as:
Tn = a+(n-1)d
a is the common difference
n is the number of terms
d is the common difference
Given the 6th term a6 = 40
T6 = a+(6-1)d
T6 = a+5d
40 = a+5d ... (1)
Given the 20th term a20 = -16
T20 = a+(20-1)d
T20 = a+19d
-16 = a+19d... (2)
Solving both equation simultaneously
40 = a+5d
-16 = a+19d
Subtracting both equation
40-(-16) = 5d-19d
56 = -14d
d = 56/-14
d = -4
Substituting d = -4 into equation
a+5d = 40
a+5(-4) = 40
a-20 = 40
a = 20+40
a = 60
Given a = 60, d = -4, to get the nth term of the sequence:
Tn = a+(n-1)d
Tn = 60+(n-1)(-4)
Tn = 60+(-4n+4)
Tn = 60-4n+4
Tn = 64-4n
Answer:
C. 
Step-by-step explanation:
Answer:
Step-by-step explanation:
(1) 6 yd 1 ft plus 9 yd 1 ft works out to 15 yd 2 ft, or 15 2/3 yd.
(2) 8' 3" less 5' 5" requires "borrowing." Since 1 ft = 12 in, your 8' 3" becomes 7' 12".
Subtracting 5' 5" from 7' 12" yields 2' 7"
(3) 25 lb 8 oz less 15 lb 10 oz also requires borrowing.
1 lb = 16 oz, so:
25 lb 8 oz = 24 lb 24 oz. Then we subtract 15 lb 10 oz from 24 lb 24 oz:
9 lb 14 oz
