Please help fast. Sets and Venn Diagrams:

Consider the following sets.
U = {all triangles}

E = {x|x E U and x is equilateral}
I = {x|x E U and x is isosceles}
S = {x|x E U and x is scalene}
A = {x|x E U and x is acute}
O = {x|x E U and x is obtuse}
R = {x|x E U and x is right}
Which is a subset of I? lI
Please explain why simply.

Cot(90° − x) = 1 the value of x that satisfies this equation is °. a. 60 b. 135 c. 225 d. 315

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.

Macy spent $36 on jeans. this was $12 less than twice what she spent on a shirt. which equation to solve this, 12x=36 2x=36-12 2x-12=36 12-2x=36