Luis can spend up to $240 buying men’s and women’s shirts for his club. men’s shirts cost $8 each and women’s shirts cost $12 each. he needs to buy at least 3 of each type of shirt. also, the women’s shirts must be at least twice the number of men’s shirts.

which combinations of men’s and women’s shirts can luis buy?

choose all answers that are correct.

a. 4 men’s shirts and 9 women’s shirts

b. 5 men’s shirts and 8 women’s shirts

c. 6 men’s shirts and 15 women’s shirts

d. 7 men’s shirts and 17 women’s shirts

Ece 202: problem set 1 due: june 14, 2019 (friday) the first 3 questions of this homework assignment covers some fundamental mathematical concepts that will play a role in this course. the remaining questions are on basic signals and laplace transforms. 1. a review of complex numbers. (a) compute the magnitude and the phase of the complex numbers −4 +j, and write them in polar form (i.e., of the form rejθ). also, plot the complex number in the complex plane. (b) simplify the complex number 1 4 − √ 1 2 − j √ 2 22 and write them in cartesian form. (c) consider the complex number s = z1z2 · · ·zm p1p2 · · · pn , where each zi is a complex number with magnitude |zi | and phase ∠zi , and each pi is a complex number with magnitude |pi | and phase ∠pi . write the magnitude and phase of s in terms of the magnitudes and phases of z1, z2, . . , zm, p1, p2, . . , pn. 2. a review of differentiation. (a) find df dx for the following functions. i. f(x) = (1−4x) 2 √ x . ii. f(x) = √ 1 + tan x. (b) find dy dx for the equation e x sin y + cos2 x cos y − x 3 = 0.