Someone please help?! Which of the following is a complex number?

-4+ square root 7/3

4/ square root 3 - 7 square root 3/5

5/2 - square root 15

2/3 + square root - 27/28

See attachment below and find the equivalent of tan(∠qsr)

The collection of beautiful oil paintings currently on display at an art gallery well defined; set not well defined; not a set

At the beginning of the year, adrian's savings account balance was \$28$28. each week, he deposits another \$15$15 into that account, and he doesn't spend any of his savings. is his savings account balance proportional to the number of weeks since the start of the year?