Afunction is defined by f(x)=5(2-x) what is f(–1)?

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.

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20