Answer: 6
Step-by-step explanation: as we already know, 45 is half of 90. So that means he is mowing 2 lawns in an hour. So in 6 hours he mows twice the amount.
Answer:
1. Im gonna say D. 126
2. 1/2 (can't see the answer choices clearly)
3. 60º
4. 9
5. D
Step-by-step explanation:
Answer:
Letter b is correct!
explanation:
The letter b is correct because it is the demand determinants that explain the changes in the aggregate demand curve. This is because the most important determinants of demand such as interest rate, Federal Deficit, expectations and money supply are not constant, so a change in any of these determinants will also affect the change in the aggregate demand curve.
Answer:
3/4 or 0.75 decimal
Step-by-step explanation:
Simplify the following:
(2/3)/(8/9)
Hint: | Write (2/3)/(8/9) as a single fraction.
Multiply the numerator by the reciprocal of the denominator, (2/3)/(8/9) = 2/3×9/8:
(2×9)/(3×8)
Hint: | In (2×9)/(3×8), divide 9 in the numerator by 3 in the denominator.
9/3 = (3×3)/3 = 3:
(2×3)/8
Hint: | In (2×3)/8, divide 8 in the denominator by 2 in the numerator.
2/8 = 2/(2×4) = 1/4:
Answer: 3/4
Answer:
68% of these phones last 3.87 years.
Step-by-step explanation:
Exponential distribution:
The exponential probability distribution, with mean m, is described by the following equation:
In which 
is the decay parameter.
The probability that x is lower or equal to a is given by:
Which has the following solution:
The probability of finding a value higher than x is:
The average lifetime of a certain new cell phone is 3.4 years.
This means that 
So
68% of these phones last how long (in years)?
This is x for which:
Then
68% of these phones last 3.87 years.
