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dancer2814
20.03.2020 •
Mathematics
A poster is to have a total area of 125 cm2. There is a margin round the edges of 6 cm at the top and 4 cm at the sides and bottom where nothing is printed. What width should the poster be in order to have the largest printed area?
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Ответ:
The correct answer is 15 cm.
Step-by-step explanation:
Let the width of the required poster be a cm.
We need to have a 6 cm margin at the top and a 4 cm margin at the bottom. Thus total margin combining top and bottom is 10 cm.
Similarly total margin combining both the sides is (4+4=) 8 cm.
So the required printing area of the poster is given by {( a-10 ) × ( a - 8) }![cm^{2}](/tpl/images/0555/7768/82289.png)
This area is equal to 125
as per as the given problem.
∴ (a - 10) × (a - 8) = 125
⇒
- 18 a +80 -125 =0
⇒
- 18 a -45 = 0
⇒ (a-15) (a-3) = 0
By law of trichotomy the possible values of a are 15 and 3.
But a=3 is absurd as a
4.
Thus the required answer is 15 cm.
Ответ:
dV(t)/dt = kV(t)
Step-by-step explanation:
Since the rate of change of the car’s value in dollars per year dV(t)/dt is proportional to the car’s value V(t), ten
dV(t)/dt ∝ V(t)
dV(t)/dt = kV(t)