Square root of 486x^2

Find the sum of the first 8 terms of the following sequence. round to the nearest hundredth if necessary.

Which of the following correctly justifies statement four of the two column proof? a. corresponding angles theorem b. transitive property of equality c. vertical angle theorem d. substitution property of equality

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m