Marginal demand. At a price of x dollars, the demand, in thousands of units, for a certain turntable is given by the demand function q = 240 e − 0.003 x . a. How many turntables will be bought at a price of $250? Round to the nearest thousand. b. Graph the demand function for 0 ≤ x ≤ 400 . c. Find the marginal demand, q ′ ( x ) . d. Interpret the meaning of the derivative.
Marginal demand. At a price of x dollars, the demand, in thousands of units, for a certain turntable is given by the demand function q = 240 e − 0.003 x . a. How many turntables will be bought at a price of $250? Round to the nearest thousand. b. Graph the demand function for 0 ≤ x ≤ 400 . c. Find the marginal demand, q ′ ( x ) . d. Interpret the meaning of the derivative.
Is the function f(x) shown in the graph below continuous at x = −5?
f(x)
7
6
5
4
2
1
0
-10
-9
-8 -7
-6
-5
-4
-3
-2
-1 0
1
2
3
4
5
6 7 8 9
10
-1
-2
-3
-4
-5
-6
-7
Select the correct answer below:
The function f(x) is continuous.
○ The right limit exists. Therefore, the function is continuous.
The left limit exists. Therefore, the function is continuous.
The function f(x) is discontinuous.
○ We cannot tell if the function is continuous or discontinuous.
4. Evaluate the following integrals. Show your work.
a)
-x
b) f₁²x²/2 + x² dx
c) fe³xdx
d) [2 cos(5x) dx
e) √
35x6
3+5x7
dx
3
g) reve
√ dt
h) fx (x-5) 10 dx
dt
1+12
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