URGENT I need answer now please

Which inverse trigonometric function will determine the measurement of B?

tan -1(0.75)
cos -1(0.6)
cot (0.75)
sin -1(0.8)

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.

Graph the equation. select integers for x

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.