Zander uses an on-line store that sells songs for $1 each and movies for $6. he used all of his $20 allowance to buy 10 items. a. write one equation in a system for this situation. b. write a second equation in the system. c. what do x and y represent? d. how many songs and how many movies did he buy?

Aman steps out of a plane at a height of 4,000m above the ground falls 2,000m very quickly and then opens his parachute and slowly falls the remaining 2000m to the ground what height above the ground would be the best choice for a reference point

Let hh represent the number of hummingbirds and ss represent the number of sunbirds that must pollinate the colony so it can survive until next year. 6h+4s > 746h+4s> 74 this year, 88 hummingbirds pollinated the colony. what is the least number of sunbirds that must pollinate the colony to ensure that it will survive until next year?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?