The force, F
(Newtons), between two objects is inversely proportional to the square of the distance,
d
(metres), between them.
The force is 0.65 Newtons when the distance between the objects is 4 metres.
Work out
F
(rounded to 2 DP) when
d
=
7
metres.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

if she was to only spend a dollar she can get 1lb

step-by-step explanation:

false

step-by-step explanation:

the reason i say this is because for a certain length of sides you can pick any two and the length is wither equal or greater than the third side and in this case it's not.

3 + 5 = 8

8 is smaller than 9 which is the third side.

hope this : )