3. the shutter speed ,s, of a camera varies inversely as the square of the aperture setting, f,. when f=8, s=125..
a) find a formula for s in terms of f.

b) hence, or otherwise, calculate the value of s when f=4.
i need now
maths

4

step-by-step explanation:

6 (donuts) divided by 3 is 2.

so 2/3 means 2 times 2, which is 4/6.

you get two and your friend gets four.

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like: