Question

answer the question pls give me fast answer then I will give you brilint mark ​

Answer 1

Answer:

1) a(1) = 550

2) a(10) = 775

3) 4375

Step-by-step explanation:

by increasing uniformly, the question says that it follows A.P.

given , a(3) = 600 & a(7) = 700

a(3) = a(1) + (3-1)×d

=> 600 = a(1) + 2d.........1

a(7) = a(1) + (7-1)d

=> 700 = a(1) + 6d..........2

subracting equation 1 from 2

we get => 700-600 = 4d

=> 4d = 100

=> d= 25

1) putting value of d in equation 1

we get , 600 = a(1) + 2(25)

=> a(1) = 600-50

=> a(1) = 550

2) a(10) = a(1) + (10-1)d

=> a(10) = 550 + 9×25

=> a(10) = 775

3) total production in first 7 year = S(7)

=> S(7) = (7/2) [ 2×550 + (7-1)×25]

=> S(7) = (7/2) [ 2×550 + 6×25 ]

=> S(7) = (7/2) [1250]

=> S(7) = 4375