Answer:(2x + 5)⁵
Step-by-step explanation:I assume you mean the 4th term of the expansion of (2x + 5)⁵. The coefficient can be found from pascal's triangle.
80 weeks
1,200+40x=400+50x
800+40x=50x
800=10x
x=80
Convert 91% to a decimal:

Multiply the amount of people by this decimal:

Round the number to the nearest ones value:
1809.
99
9 > 5
1809.99 -> 1810
1,810 people have reached the top of Mount Everest.
0.
1/2 = 1/2
No need to add anything