Rory Lynch

Mathematics

25 February, 07:41

Can someone check my answers?

The amount of money in Alexander's account is, = 4000 - 70, where is the amount in dollars and is the time in weeks.

a) Which variable is independent and which is dependent?

Answer: Dependent is - 70x and independent is 4000

b) In which week will there be $1701 in the account?

Answer:

y=4000-70 (x)

1701=4000-70 (x)

-70x=1701-4000

-70x = - 2299

x=-2299/-70

x=2299/70

x=32.843

x=33

c) How much will the amount in Alexander's account change if the time increases by 15 weeks?

Answer:

y=4000-70 (x)

y=4000-70 (15)

y=2950