I need someone to explain it on paper plzz it’s a time test

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?

To prove that angle def = angle dgf by sas, what additional information is needed? def congruent to dgf dfe congruent to dfg de congruent to dg dg congruent to gf

How can writing phrases as algebraic expressions you solve problems?