Suppose the demand for Digital Video Recorders (DVRs) is given by Q = 250 - .25 p + 4 pc, where Q is the quantity of DVRs demand
1 answer:
Answer:
Δp = -4 units
Explanation:
For calculating how the quantity of DVRs demanded changes, when the price is modified in one unit, we calculate the derivative of Q with respect to p
This means that when the price increases in one unit the quantity of DVRr demanded reduces in 0.25 units. Then the price must be reduced in 4 units for to obtain one unit more demanded.
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Answer:
Speed of the ball relative to the boys: 25 km/h
Speed of the ball relative to a stationary observer: 35 km/h
Explanation:
The RV is travelling at a velocity of
Here we have taken the direction of motion of the RV as positive direction.
The boy sitting near the driver throws the ball back with speed of 25 km/h, so the velocity of the ball in the reference frame of the RV is
with negative sign since it is travelling in the opposite direction relative to the RV. Therefore, this is the velocity measured by every observer in the reference frame of the RV: so the speed measured by the boys is
v = 25 km/h
Instead, a stationary observer outside the RV measures a velocity of the ball given by the algebraic sum of the two velocities:
v = +60 km/h + (-25 km/h) = +35 km/h
So, he/she measures a speed of 35 km/h.