49 (3 ma
9th
с
Iris coats the outside of each sphere with gold paint.
The paint costs £3.35 per cm?
Show that the cost of the paint that Iris uses is £4640, correct to three
significant figures.
The formula for the surface area of a sphere is A = 4tr2

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.