WDYM BY SUBSTITUTION when u get the two proportions, u say "substitute" im giving 100

In parallelogram abcd the ratio of ab to bcis 5: 3. if the perimeter of abcd is 32 find ab

What is the distance between (5 - 2i) and (8 + i)?

Students planted 6 equals size gardens on earth day. they divided each garden into three equal sections and planted herbs in 2 of the 3 sections what fraction of the gardens did the students plant with herbs.