Imma need some help please

I didn't put the answer up here, you can try it on your own.  Then check your answer against mine at the bottom.  ;-)

Step-by-step explanation:

First you need to find how many years passed between 1950 and the year in the question.

the first one sold 91,299 record in 1961.  So 1961-1950=11

It says let f(t)= 'n'  ('the number of records).  't' will be the number of years for each question

So f(t)=n

'f' is unknown t is 11 and n is 91,299

f(11)=91,299

The second on says 68,594 sold in 1958.  So 1958-1950=8

f(8)=68594

Third

f(2)=38720

Last

f(17)=161743

what is it?

Step-by-step explanation:Ok yea

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 -