Answer:
526.39 million
Step-by-step explanation:
The exponential equation can be written as ...
p(t) = 471.56(492.53/471.56)^(t/10)
Then p(25) ≈ 525.75 . . . . million
__
The closest answer choice is 526.39 million.
__
<em>Comment on the answer choice</em>
Reverse-engineering the answer, we find it was computed using the exponential equation ...
p(t) = 471.56e^(0.0044t)
p(25) = 471.56·1.116278 ≈ 526.39
The k factor in the exponent is <em>inappropriately rounded</em> from 0.004350903. You cannot use a 2-significant-figure constant to arrive at an accurate 5-significant-figure answer.
Answer:
65 ft
Step-by-step explanation:
Negative and positive numbers can be expressed as how far away they are from zero.
40 is 40 units away from zero. Elevator 1 is 40 units from 0.
-25 is 25 units away from zero. Elevator 2 is 25 units from 0.
To find the distance, we'll add their distances from 0.
40 + 25 = 65
They are 65 units apart. In your problem you specify feet, so they are 50 ft apart.
15a^3+6a^2+25a+10
hope this helps!!!
Answer: the rate of the westbound train is 85 mph.
Step-by-step explanation:
Let x represent the rate of the westbound train. The westbound train travels 10 miles per hour slower than the eastbound train. It means that the rate of the eastbound train is (x + 10) mph.
The two trains leave the station at the same time. The total distance covered by both trains after 3 hours is 540 miles.
Distance = speed × time
Distance covered by the westbound train in 3 hours is 3x.
Distance covered by the eastbound train in 3 hours is 3(x + 10)
Therefore,
3x + 3(x + 10) = 540
3x + 3x + 30 = 540
6x = 540 - 30 = 510
x = 510/6 = 85 mph
