Sine of angle K= 1/2, square root of 3/3, 2 times the square root of 3, 2

B or 2nd choice

don't know if exact

Step-by-step explanation:

Sin(x) = 5√3/10 = 0.866025404

sin(x) = 0.866025404

x = sin^-1(0.866025404)

x = 60.00000002°

1/2 ≠ 60

√3/3 = 0.577350269

close enough

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a