If −20 is the 15th term in an arithmetic sequence with a common difference of −7, what is the first term in the sequence?

Evaluate the expression. (9 + 5)(3 + 2)0

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.

Cole says the distance between points (-5,0) and (0,-5)is 5 units. is he correct? explain why or why not.