Evaluate b-\left(-\dfrac{1}{8}\right)+cb−(− 8
1

)+cb, minus, left parenthesis, minus, start fraction, 1, divided by, 8, end fraction, right parenthesis, plus, c where b = 2b=2b, equals, 2 and c = -\dfrac{7}{4}c=−
4
7

c, equals, minus, start fraction, 7, divided by, 4, end fraction.

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.