Solve the proportion below
90\x = 3\4
x=

a. 150
b. 120
c. 99
d. 91

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

True or false look at the picture pls : /

Find the amount of simple interest earned for depositing the given principle in an account if $2200 is invested at 5.5 % for 6 months