One can identify complex numbers and vector on the plane r 2 as a+ib ≡ (a, b). find the matrix b = [ b11 b12 b21 b22] such that, using this identification, e iϕ(a + ib) ≡ ( b [ a b ])t where t denotes the transpose. now use this to explain geometrically the action of the matrix b on the vector [ a b ] .

Me, the vertices of quadrilateral coat are c(2,0), o(7,0), a(7,2) and t(2,2). prove that coat is a rectangle.

Someone answer this asap rn for ! a discount store’s prices are 25% lower than department store prices. the function c(x) = 0.75x can be used to determine the cost c, in dollars, of an item, where x is the department store price, in dollars. if the item has not sold in one month, the discount store takes an additional 20% off the discounted price and an additional $5 off the total purchase. the function d(y) = 0.80y - 5 can be used to find d, the cost, in dollars, of an item that has not been sold for a month, where y is the discount store price, in dollars. create a function d(c(x)) that represents the final price of an item when a costumer buys an item that has been in the discount store for a month. d(c(x)) =

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"