Food versus Education The percentage y (of total personal consumption) an individual spends on food is approximately y = 35 x − 0.25 percentage points ( 6.5 ≤ x ≤ 17.5 ) , where x is the percentage the individual spends on education. An individual finds that she is spending x = 7 + 0.2 t percent of her personal consumption on education, where t is time in months since January 1. Use direct substitution to express the percentage y as a function of time t (do not simplify the expression), and then use the chain rule to estimate how fast the percentage she spends on food is changing on November 1. Be sure to specify the units. [ HINT: See Example 3(a).]
Food versus Education The percentage y (of total personal consumption) an individual spends on food is approximately y = 35 x − 0.25 percentage points ( 6.5 ≤ x ≤ 17.5 ) , where x is the percentage the individual spends on education. An individual finds that she is spending x = 7 + 0.2 t percent of her personal consumption on education, where t is time in months since January 1. Use direct substitution to express the percentage y as a function of time t (do not simplify the expression), and then use the chain rule to estimate how fast the percentage she spends on food is changing on November 1. Be sure to specify the units. [ HINT: See Example 3(a).]
Solution Summary: The author calculates the percentage y (of total personal consumption) an individual spends on food as a function of time t by using direct substitution.
Food versus Education The percentage y (of total personal consumption) an individual spends on food is approximately
y
=
35
x
−
0.25
percentage points
(
6.5
≤
x
≤
17.5
)
,
where x is the percentage the individual spends on education. An individual finds that she is spending
x
=
7
+
0.2
t
percent of her personal consumption on education, where t is time in months since January 1. Use direct substitution to express the percentage y as a function of time t (do not simplify the expression), and then use the chain rule to estimate how fast the percentage she spends on food is changing on November 1. Be sure to specify the units. [HINT: See Example 3(a).]
Consider the following system of equations, Ax=b :
x+2y+3z - w = 2
2x4z2w = 3
-x+6y+17z7w = 0
-9x-2y+13z7w = -14
a. Find the solution to the system. Write it as a parametric equation. You can use a
computer to do the row reduction.
b. What is a geometric description of the solution? Explain how you know.
c. Write the solution in vector form?
d. What is the solution to the homogeneous system, Ax=0?
2. Find a matrix A with the following qualities
a. A is 3 x 3.
b. The matrix A is not lower triangular and is not upper triangular.
c. At least one value in each row is not a 1, 2,-1, -2, or 0
d. A is invertible.
Find the exact area inside r=2sin(2\theta ) and outside r=\sqrt(3)
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