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In **Mathematics** / **College** | 2025-08-20

[Done] What is the simplified form of this expression? $(9 x-7)-(4 x-11)$ A. $9 x$ B. $5 x-18$ C. $5 x+4$ D. $13 x+4$

In **Mathematics** / **High School** | 2025-08-20

[Done] Sound intensity $(I)$ is measured in watts per meter squared $\left(\frac{W}{m^2}\right)$, and the loudness of the sound, $L(I)$, which is measured in decibels $(d B)$, is decreased by the function $L(I)=10 \log \left(\frac{I}{I_0}\right)$. A barely audible sound has intensity $I_0=10^{-12} \frac{W}{ m ^2}$. Rounded to the nearest tenth of a decibel, what is the loudness, in decibels, of a musical group that plays with sound intensity of $I=6.7 \times 10^{-3} \frac{W}{ m ^2}$ ? A. 8.2 B. 98.3 C. 9.8 D. 76.5

In **Computers and Technology** / **College** | 2025-08-20

[Done] What is the final phase of the HDTV signaling process? A. modulation B. synchronization C. encoding D. decoding

In **Mathematics** / **College** | 2025-08-20

[Done] In the equation [tex]$6 x-2=-4 x+2$[/tex], Spencer claims that the first step is to add [tex]$4 x$[/tex] to both sides. Jeremiah claims that the first step is to subtract [tex]$6 x$[/tex] from both sides. Who is correct? Explain.

In **Mathematics** / **High School** | 2025-08-20

[Done] What is the sum of the geometric series? [tex]\sum_{n=1}^4(-2)(-3)^{n-1}[/tex]

In **Mathematics** / **College** | 2025-08-20

[Done] Which relation is also a function? A. B. \begin{tabular}{|c|c|} \hline$x$ & $y$ \ \hline 10 & 1 \ \hline 15 & 2 \ \hline 15 & 3 \ \hline \end{tabular}

In **Mathematics** / **High School** | 2025-08-20

[Done] Rachel states that 5.5 is an integer because it is negative. Why accept 4.0, but not 5.5?

In **Mathematics** / **High School** | 2025-08-20

[Done] The town librarian bought a combination of new-release movies on DVD for $20 and classic movies on DVD for $8. Let [tex]$x$[/tex] represent the number of new releases, and let [tex]$y$[/tex] represent the number of classics. If the librarian had a budget of $500 and wanted to purchase as many DVDs as possible, which values of [tex]$x$[/tex] and [tex]$y$[/tex] could represent the number of new-release and classic movies bought? [tex]$x=8, y=45$[/tex] [tex]$x=16, y=22$[/tex] [tex]$x=10, y=22$[/tex] [tex]$x=18, y=18$[/tex]

In **Mathematics** / **High School** | 2025-08-20

[Done] Xander started doing his homework at 3:45 PM, and he finished at 5:30 PM. How many hours and minutes did it take him to complete his homework? A. 1 hour and 15 minutes B. 1 hour and 45 minutes C. 2 hours and 15 minutes D. 1 hour and 30 minutes

In **Mathematics** / **College** | 2025-08-20

[Done] Which of the following is an even function? $f(x)=(x-1)^2$ $f(x)=8 x$ $f(x)=x^2-x$ $f(x)=7$