Given a = ( 1.5,- 0.75) and b = (-3,2) find the direction of 4a + 2b.
A.

0.1° N of W
B.

4.8° N of W
C.

107.4° N of E
D.

173.6° N of E

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.