The number of fish in a lake is decreasing by 400 every year, as described by the function below. f(1)=8200

f(n+1)=f(n)-400
A. 6200
B. 6600
C. 7000
D. 7800

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

the correct answer is 1.7

point m is on plane r

umm you say your want to . but you do know that this is the mathematics.  

o~o