<span>The total equivalent warming impact (TEWI) takes into consideration both the direct and indirect global warming effects of refrigerants.
In addition to the direct impact of the refrigerant (which is conveniently estimated by GWP), any system or process, which requires energy input, indirectly affects the environment. This impact is originated from CO2 emissions from the energy production processes.
TEWI can be calculated using the equation below:
TEWI = direct emissions + indirect emissions = (GWP×L×N)+(Ea×β×n),
where
L – annual leakage rate in the system, kg (3% of refrigerant charge annually),
N – life of the system, years (15 years),
n – system running time, years (based on weather data, 4910 hours),
Ea – energy consumption, kWh per year (modelled for each refrigerant),
β – carbon dioxide emission factor, CO2-eq. emissions per kWh (165 g CO2/kWh).</span>
Answer:
$18.74
Explanation:
the margin of error for a 95% confidence level = Z x (σ / √n)
- Z for a 95% confidence level = 1.96
- standard deviation (σ) = $160
- sample size (n) = 280
the margin of error for a 95% confidence level = 1.96 x ($160 / √280) = 1.96 x ($160 / 16.733) = 1.96 x $9.56 = $18.74
Rick gave his son $100 to buy food and drinks. His son returned with $25.50 in change. Therefore the amount spent was
$100 - $25.50 = $74.50.
Let
x = number of hot dogs bought (at $3.50 per hot dog).
y = number of milk shakes bought (at $8 per milk shake).
There were 8 orders of soda at $5 per soda.
The total order is $74.50, therefore
3.50x + 8y + 8*5 = 74.50
Simplify to obtain
8y = 74.5 - 3.5x
y = 4.3125 - 0.4375x
We must have whole numbers (integers) for x and y.
Create a table that varies x from 0 to 8, and look for y to be an integer, as shown below.
x y
--- -------
0 4.3125
1 3.8750
2 3.4375
3 3
4 2.5625
5 2.1250
6 1.6875
7 1.2500
8 0.8125
Because we cannot have fractional values for either x or y, the solution is x=3, y=3
Answer:
3 hot dogs, 3 milk shakes, and 8 sodas.
Answer: A. the 99 principle
Explanation:
This strategy, often called "charm pricing," involves using pricing that ends in "9" and "99."
With charm pricing, the left digit is reduced from a round number by one cent. We come across this technique every time we make purchases but don’t pay attention. For example, your brain processes $3.00 and $2.99 as different values: To your brain $2.99 is $2.00, which is cheaper than $3.00.
How is this technique effective? It all boils down to how a brand converts numerical values. In 2005, Thomas and Morwitz conducted research they called "the left-digit effect in price cognition." They explained that, “Nine-ending prices will be perceived to be smaller than a price one cent higher if the left-most digit changes to a lower level (e.g., $3.00 to $2.99), but not if the left-most digit remains unchanged (e.g., $3.60 to $3.59).”
Answer:
Total= 20 potatoes + 2 steaks
Explanation:
Giving the following information:
Her budget is $30 for every 10 days and she must buy enough potatoes to eat at least 2 potatoes per day. If a potato costs $0.50 and the price of a steak is $10.
2 potatoes a day= 0.5*2= 1
Consumption of potatoes= 10 days*$1= $10
Consumption of steak= 30 - 10= 20/10= 2 steaks.
Total= 20 potatoes + 2 steaks
