To solve this problem you must apply the proccedure shown below:
1- You have that the laddder makes an angle of
with the ground and the top of the ladder reaches
.
2- Therefore, you have:

Where:

3-You must substitute values and solve for the lenght, as following:

Therefore, the answer is: 
Answer:
C
Step-by-step explanation:
Y - 4 = -2x + 10 Multiply -2 to the inside the brackets
Y = -2x + 14 Add the 4 over
Answer:
780.54-455=425.54
Step-by-step explanation:
425.54+1570.85+12.60+9.50=2018.49