PRE CAL Let a = 2i + 9j, b = –4i + 5j, c = i – 3j, and d = 14j where i and j are unit vectors.

What is (a – b) – (2d – c) in terms of i and j?

5i – 27j
5i + 35j
7i – 27j
7i + 39j

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

Lines b and c are parallel. what is the measure of 2? m2 = 31° m2 = 50° m2 = 120° m2 = 130°

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.