I have an exam on tuesday and if i fail i will repeat the same grade so i really need your help with some questions.. I need the answers and working out also:

NOTE: They are not 'all' algebra

1) Work out 7-5x(6-1).

2) Tiago's father buys a car for $18500.

During the first year its value falls by 20%.

Calculate its value at the end of the first year,

3) Tiago buys a bicycle for $ 240.

During the first year it loses 13/40 of its value.

Calculate its value at the end of the first year.

4) The nth term of a sequence is given by the formula

n2(squared)

------- (over)

n+1

find (i) the 9th term,

(ii) the 99th term

Thank you.