Use the unit circle to find tan 30°.
a. 3
b. square root 3/2
c. 1/2
d. 2

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4

20 ! brainliest ! add and simplify your answer.