What is the value of -a a=-4.2 a.-4.2 b.4.2

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

Acompany is testing in comparing to lightbulb designs the box plot shows the number of hours that each lightbulb design last before burning out which statement is best supported by the information of the plot

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?