Select or equation that represents a relationship between ankles and the figure A. 90-30=b
B. 30+b=a+c
C. a+c+30+b=180
D. a=30
E. a=c=30
F. 90+a+c=180​

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.