On each of tree days derrick rode 6.45 km to school,150 meters to the library and then 500 meters back home. how many kilometers did he ride all together

The distance around the lake is 2 kilometers. ifelena wants to run 14 kilometers this week, howmany laps must she run around the lake

How do you use the elimination method for this question? explain, because i really want to understand!

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36