I believe there was 100 red bricks used and 40 grey bricks used.
The population starts at 56,000.
After 1 year, it's (56,000) x (1.02) .
After 2 years, it's (56,000) x (1.02) x (1.02)
After 3 years, it's (56,000) x (1.02) x (1.02) x (1.02)
.
.
After ' n ' years, it's (56,000) x (1.02)ⁿ .
We want to know what ' n ' is when the population reaches 80,000 .
At that time . . .
80,000 = (56,000) x (1.02)ⁿ
Divide each side by 56,000 :
(80/56) = (1.02)ⁿ
Sorry, but now I have to take the log of each side:
log(80) - log(56) = n · log(1.02)
Divide each side by log(1.02) , and you have an expression for ' n ' :
n = [ log(80) - log(56) ] / log(1.02)
n = (1.903 - 1.748) / (0.0086)
n = 18 years
You can check this.
Just stuff (56,000) · (1.02)¹⁸ into your calculator.
I did that, and I got 79,981.8 , which is really awfully close to 80,000 .
Answer:
199
Step-by-step explanation:
i dont know
Answer:
Step-by-step explanation:
i need help to
The wall area is the product of the room perimeter and the room height:
A₁ = (2*(12.5 ft + 10.5 ft))*(8.0 ft) = 368 ft²
The window and door area together is
A₂ = 2*((4 ft)*(3 ft)) + (7 ft)*(3 ft) = 45 ft²
The area of one roll of wallpaper is
A₃ = (2.5 ft)*(30 ft) = 75 ft²
Then the number of rolls of wallpaper required will be
1.1*(A₁ - A₂)/A₃ ≈ 4.74
5 rolls of wallpaper should be purchased.
_____
As a practical matter, not much of the window and door area can be saved. The rolls are 30 inches wide, but the openings are 36 inches wide. Some will likely have to be cut from two strips. The strips will have to be the full length of the wall, and the amount cut likely cannot be used elsewhere. If the window and door area cannot be salvaged, then likely ceiling(5.4) = 6 rolls will be needed (still allowing 10% for matching and waste).
