Consider U = {xlx is a negative real number}. Which is an empty set? A. {xlx E U and x has a negative cube root} B. {xlx E U and x has a negative square root} C. {xlx E U and x is equal to the product of a positive number and -1} D. {xlx E U and x is equal to the sum of one negative and one positive number}

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Find the zeros of each function. f(x) = x^2 + 5x - 6

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min. if they did not stop driving, how many miles could kyle and elijah drove in a whole day? ? 1 day = 24 hours. plzzz write a proportion i will give you 100 points