Three sets of a sum of a number and four are added to the sum of seven times the same a number and thirteen.

Mp model with mathematics explain how the number of text messages dario sent and the cost form an arithmetic sequence.then write an expression to find dario's text messaging bill if he sends n text messages over 250.

If a distance of 75 yds is measured back from the edge of the canyon and two angles are measured , find the distance across the canyon angle acb = 50° angle abc=100° a=75 yds what does c equal?

Parallel lines r and s are cut by two transversales, parallel lines t and u. which angles are corresponding angles with angle 8