The annual expenditure for cell phones and cellular service varies in part by the age of an individual. The average annual expenditure E a in $ for individuals of age a (in yr) is given in the table. a. Use regression to find a quadratic function to model the data. b. At what age is the yearly expenditure for cell phones and cellular service the greatest? Round to the nearest year. c. What is the maximum yearly expenditure? Round to the nearest dollar.
The annual expenditure for cell phones and cellular service varies in part by the age of an individual. The average annual expenditure E a in $ for individuals of age a (in yr) is given in the table. a. Use regression to find a quadratic function to model the data. b. At what age is the yearly expenditure for cell phones and cellular service the greatest? Round to the nearest year. c. What is the maximum yearly expenditure? Round to the nearest dollar.
Solution Summary: The author calculates the quadratic function by using regression. The average annual expenditure of individuals of various ages is given in the table.
The annual expenditure for cell phones and cellular service varies in part by the age of an individual. The average annual expenditure
E
a
in $
for individuals of age a (in yr) is given in the table.
a. Use regression to find a quadratic function to model the data.
b. At what age is the yearly expenditure for cell phones and cellular service the greatest? Round to the nearest year.
c. What is the maximum yearly expenditure? Round to the nearest dollar.
Write the given third order linear equation as an equivalent system of first order equations with initial values.
Use
Y1 = Y, Y2 = y', and y3 = y".
-
-
√ (3t¹ + 3 − t³)y" — y" + (3t² + 3)y' + (3t — 3t¹) y = 1 − 3t²
\y(3) = 1, y′(3) = −2, y″(3) = −3
(8) - (888) -
with initial values
Y
=
If you don't get this in 3 tries, you can get a hint.
Question 2
1 pts
Let A be the value of the triple integral
SSS.
(x³ y² z) dV where D is the region
D
bounded by the planes 3z + 5y = 15, 4z — 5y = 20, x = 0, x = 1, and z = 0.
Then the value of sin(3A) is
-0.003
0.496
-0.408
-0.420
0.384
-0.162
0.367
0.364
Question 1
Let A be the value of the triple integral SSS₂ (x + 22)
=
1 pts
dV where D is the
region in
0, y = 2, y = 2x, z = 0, and
the first octant bounded by the planes x
z = 1 + 2x + y. Then the value of cos(A/4) is
-0.411
0.709
0.067
-0.841
0.578
-0.913
-0.908
-0.120
Elementary Statistics: Picturing the World (7th Edition)
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