Cosine is

which applies to a right triangle. I hope that helps you.
Answer: 5.5 seconds
Step-by-step explanation:
30=5/4 ×(-20) + 10t
30 =-25 +10t
10t=55
t=5.5seconds
The cord will first touch the corner of the building after 5.5secs
Answer: 
Step-by-step explanation:
Given
Marcos purchased a sailboat for 
Each year the boat will decrease in value by 
After 1 year it is

after another year it becomes

After
years it is


Answer: Median = 3
Explanation:
Sort the numbers to get {1,2,3,5,6}. The middle most number is 3, so that's the median.
Answer:
I think this is what the graph looks like.
Step-by-step explanation:
I hope this helps.sorry if it's wrong.