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

Sera sells t-shirts at the beach. she believes the price of a t-shirt and the number of t-shirts sold are related. she has been experimenting with different prices for the t-shirts. she has collected a data set with five pairs of data; each consists of the price of a t-shirt and the number of shirts sold. the independent variable, which will go on the x-axis, is . the dependent variable, which will go on the y-axis, is the