What is 5.19615242 rounded to

Solve |2x - 5| = 4 if anyone could , that would be great

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

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