What is an equivalent expression for y 1/5?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

Pleting the square f the given find the x-intercepts of the parabola with vertex (-5,13) and y-intercept (0, 12). write your answer in this form: (14,.99). if necessary, round to the nearest hundredth. *- h enter the correct answer, de verter, and ametry 00000 done doo