I believe its 15 girls.
If its 5 girls to every 4 boys and there is 12 boys then 12 is just 4 three times so you would do 5 three times making it 15.
4boys = 5girls
+4boys= 5girls
+4boys = 5girls
=12boys = 15girls
Answer:
Top left
Step-by-step explanation:
We can plug in the y intercept to find which graph has the correct one.
x = 0 is y intercept
Thus
At this point we known the y intercept is -3 so both graph in the left is considerable.
Notice that the base is the negative, thus the graph would goes down. Therefore the top left would be correct.
Answer: Heat rejected=150000MW
Heat rate= 2.5
Step-by-step explanation:
Thermal efficiency is defined as work out divided by heat in.
Therefore
thermal efficiency = 40/100= 100000 MW/Heat in
Heat in = 250000MW
For a closed system undergoing a cycle the change in internal energy is zero. Therefore the work out of the system is equal to the net heat transfer of the system. Therefore
Work out= heat in - heat out
Therefore heat out = heat in - work out
Heat out = 250000 MW - 100000MW = 150000 MW which is the amount of heat rejected
The heat rate is defined as the inverse of the thermal efficiency expressed in kJ/kWh.Therefore
Heat rate = 1/thermal efficiency
Heat rate = 1/0.4 = 2.5 kJ/kWh
Answer:
Always true
All real numbers
Step-by-step explanation:
- 2z - 3 = 2z -3
- Move all terms containing z to the left side of the equation.
- -3 = -3
Kingsley must multiply the measure in centimeters by 1 / 2.54 to get a unit conversion equation in inches.
<h3>How to derive a unit conversion formula?</h3>
Kingsley knows the conversion rate between inches and centimeters and wants to derive a formula. Both the inch and the centimeter are length units and we can represent it by the following ratio:
y / x = 2.54 (1)
Where:
- y - Length, in centimeters.
- x - Length, in inches
Then, we clear the variable x in (1) to find the unit conversion formula:
x = y / 2.54 (2)
Kingsley must multiply the measure in centimeters by 1 / 2.54 to get a unit conversion equation in inches.
To learn more on unit conversions: brainly.com/question/11543684
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