Add the two expressions
-4.2x+3 and 2.5x-6

please help me with this

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

21 type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. the solution set of n2 - 14n = -45 is { (separate the solutions with a comma)

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?