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Questions in mathematics

[Done] Which expression is equivalent to $\left(x^2-5 x\right)\left(3 x^2+2 x-9\right)$ ? A. $x^2\left(3 x^2+2 x\right)-5 x(2 x-9)$ B. $x^2\left(3 x^2+2 x-9\right)-5 x$ C. $x^2\left(3 x^2+2 x-9\right)+5 x\left(3 x^2+2 x-9\right)$ D. $x^2\left(3 x^2+2 x-9\right)-5 x\left(3 x^2+2 x-9\right)$

[Done] Use the substitution method to solve the system of equations: [tex] \begin{array}{l} x+y=12 \\ -x=-y-10 \end{array} [/tex] A. $(8,4)$ B. $(9,3)$ C. $(10,2)$ D. $(11,1)

[Done] Simplify $(3 x^3 y^2-5 x y^4-2 x y)+(2 x^3 y^2+5 x y^4+3 x y)$.

[Done] Which polynomial functions are written in standard form? Select all that apply. [tex]$f(x)=8-x^5$[/tex] [tex]$f(x)=-3 x^5+5 x-2$[/tex] [tex]$f(x)=2 x^5+2 x+x^3$[/tex] [tex]$f(x)=x^3-8 x^2$[/tex]

[Done] $400 \times \frac{\left[\left(1+\frac{0.065 \%}{12}\right)^{(12 \cdot 18)}-1\right]}{\frac{0.065}{12}}

[Done] If $h(x)=5+x$ and $k(x)=\frac{1}{x}$, which expression is equivalent to $(k \circ h)(x) ? $\frac{(5+x)}{x}$ $\frac{1}{(5+x)}$ $5+\left(\frac{1}{x}\right)$ $5+(5+x)$

[Done] An arc on a circle measures $295^{\circ}$. The measure of the central angle, in radians, is within which range? A. 0 to $\frac{\pi}{2}$ radians B. $\frac{\pi}{2}$ to $\pi$ radians C. $\pi$ to $\frac{3 \pi}{2}$ radians D. $\frac{3 \pi}{2}$ to $2 \pi$ radians

[Done] Mark recorded the number of push-ups he did each day for a week. His results were: 20, 25, 30, 25, 35, 20, 25. Based on the data: What is the mean number of push-ups Mark did per day? What is the median number of push-ups? What is the mode of the data?

[Done] Mang Mario made a rectangular garden plot for his plants. Its measures are 11 meters in length and 16 meters in width. What is the area of the rectangular garden plot?

[Done] What is the center of a circle whose equation is $x^2+y^2-12 x-2 y+12=0$? A. $(-12,-2)$ B. $(-6,-1)$ C. $(6,1)$ D. $(12,2)$