The lengths of the rectangle have been measured to the nearest tenth of a metre.
Work out the following, writing down all the figures on your calculator display:
a) The upper bound for the perimeter of the rectangle.

15.8 m
5.2 m​

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.