Linear Algebra
There are 144 boys and girls. If there are 40% more boys than girls, how many of each are there?
boys girls
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Linear Algebra
In an election campaign, the popularity, B, as a percent of voters, of the governing Blue party can be modelled by a function of time, t, in days throughout the campaign as B(t) = 40 - 0.5t. The popularity, R(t), of the opposing Red party can be modelled by a composite function of B(t),R(B(t)) = 20 + 0.75[40 – B(t)].
Graph B(t) and describe the trend.
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Linear Algebra
\text { 4] Find } g(0)-g(9)+g(2) \text {, if }
g(x)=\left\{\begin{aligned}
\frac{x+1}{2}, & \text { if } x \text { is odd } \\
\frac{x}{2}, & \text { if } x \text { is even }
\end{aligned}\right.
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Linear Algebra
\text { 3] Find } f(4)-f(2)+f(3) \text {, if }
f(x)=\left\{\begin{array}{ll}
\frac{x+1}{2}, & \text { if } x \text { is odd } \\
\frac{x}{4}, & \text { if } x \text { is even }
\end{array}\right.
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Linear Algebra
2] Find the Domains of the following functions:
\text { a) } f(x)=\sqrt{15-5 x}
f(x)=\frac{x^{2}-2 x+1}{x^{2}-4 x-21}
f(x)=\frac{x^{2}-2 x+1}{\sqrt{16-2 x}}
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Linear Algebra
a) Give the definition of a rational function. [5 pts]
b) Give an example of a polynomial function of degree 3. [5 pts]
c) Can a constant function be a polynomial and a rational function at the same time? Explain your answer. [5 pts]
d) Give an example of a non-polynomial function and explain why not apolynomial function. [10 pts)
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Linear Algebra
5) Ве,
\begin{array}{c}
f: \mathbb{R} \rightarrow \mathbb{R} \\
f(x)=\left\{\begin{array}{ll}
x^{2}-3 \cos (\pi x) & x<0 \\
x-4 e^{-2 x} & x \geq 0 .
\end{array}\right.
\end{array}
Calculate
\int_{-1}^{2} f(x) d x
Presenting the result in simplified form
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Linear Algebra
4) Be f: R - Ra function differentiable in R such your derivative f', has in maximum a real zero.
Prove that the equation f(x)=0 has in maximum 2 real square
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Linear Algebra
3) Take in consideration the following function
f(x)=\left\{\begin{array}{ll}
f: \mathbb{R} \rightarrow \mathbb{R} & \\
\frac{x^{2}-4 x+\cos (\sin (x)),}{x^{4}+4 x^{2}+1}, & x \leq 0
\end{array}\right.
a) Show that the function f is continuous in R+ and in R- but discontinuous in the point X
b) Say justifying, if f is differenciable in X=0
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Linear Algebra
2) Prove by definition that
\lim _{x \rightarrow 0} x^{2} \cos \left(e^{x}\right)=0
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Linear Algebra
1) Calculate the following limit:
\lim _{x \rightarrow+\infty} \frac{x^{2}\left(e^{-3 x}+1\right)+x \cos (5 x)}{x^{2}+7 x+1}
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