Question

Given the formula S = n(a+b)/2
(a) find the value of S when a = 1, b = 25 and n=12
(b) find the value of a when b = 41, n = 15 and S = 330
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Answer 1

Step-by-step explanation:

S= n(a +b ) /2

S= 12 ( 1 +25 )/2

12 (26)/2

12 × 2( cansalizatio)

24

Answer 2

Answer:

(a)

s= 12(1+25) / 2

so s= (12*26)/2 = 156

(b)

330 = 15(a+41) /2

so a= (660/15) -41

a= 44- 41

a = 3