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Without graphing the linear functions, find the coordinates of the point of intersection of their graphs: y=3x−11 and y=4

The triangles are similar. what is the value of x? show your work.

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is