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Questions in Grade High-school

📝 Answered - Question 3 (5 points) Listen [tex]$9 / 11=? / 22$[/tex]

📝 Answered - What is the true solution to the logarithmic equation below? [tex]$\log _4\left[\log _4(2 x)\right]=1$[/tex] A. [tex]$x=2$[/tex] B. [tex]$x=8$[/tex] C. [tex]$x=64$[/tex] D. [tex]$x=128$[/tex]

📝 Answered - What is the standard form of the equation of a parabola that opens up or down? A. $x=a(y-y)^2+h$ B. $x=a y^2+b y+c$ C. $y=a(x-h)^2+v$ D. $y=a x^2+b x+c$

📝 Answered - There are five runners in a race. How many different ways can they cross the finish line? [tex] \begin{array}{c} { }_n P_r=\frac{n!}{(n-r)!} \ 0!=1 \end{array} [/tex]

📝 Answered - The surface area of a small piston is $\frac{1}{10}$ the surface area of a large piston. Find the input force if the output force is $20,000 N.

📝 Answered - Calculate the temperature at which technetium becomes superconducting in degrees Celsius. Round your answer to 5 significant figures.

📝 Answered - A member of a book club wishes to purchase two books from a selection of eight books recommended for a certain month. In how many ways can she choose them? ${ }_n C_r=\frac{n!}{r!(n-r)!}$

📝 Answered - A scientific calculator is required to answer the following question. A particle [tex]$P$[/tex] is traveling along the [tex]$x$[/tex]-axis with displacement [tex]$s(t)$[/tex] from a fixed origin [tex]$O$[/tex] given by [tex]$s(t)=(t+1) e^{-t}, \quad t \geq 0$[/tex] Find the time at which the acceleration is zero, and find the value of the velocity at this moment. a [tex]$t=2, \quad v=-\frac{2}{e^2}$[/tex] b [tex]$t=1, \quad v=-\frac{1}{e}$[/tex] c [tex]$t=\frac{1}{2}, \quad v=\frac{1}{2 \sqrt{e}}$[/tex] d [tex]$t=\frac{1}{2}, \quad v=-\frac{1}{\sqrt{e}}$[/tex] e [tex]$t=1, \quad v=\frac{1}{e^2}$[/tex]

📝 Answered - Compare $7 / 8$ with $14 / 16$ using ( $<,>,=$ ).

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?