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Questions in mathematics

[Done] [tex]\frac{2}{5}+13 k-1=5 k-\frac{3}{5}[/tex]

[Done] Find the $x$ and $y$ intercepts of the following linear equation: $-5 x+4 y=-40$ x-intercept ( [ ? ], $\square$ ) y-intercept ( $\square$ , $\square$ )

[Done] 15. [tex]$3^{-3}$[/tex]

[Done] The density of a certain material is such that it weighs 8 pounds per cup of volume. Express this density in ounces per gallon. *Note: you must use these exact conversion factors to get this question right. \begin{tabular}{|l|l|} \hline Weight / mass & Volume \\ \hline 1 pound (lb) = 16 ounces (oz) & 1 cup (cup) = 8 fluid ounces (fl oz) \\ \hline 1 ton (ton) = 2000 pounds (lb) & 1 pint (pt) = $2 \operatorname{cups}(\operatorname{cups})$ \\ \hline 1 gram (g)=1000 milligrams (mg) & 1 quart ( qt ) = 2 pints ( pt ) \\ \hline 1 kilogram (kg) = 1000 grams (g) & 1 gallon $( gal )=4$ quarts $( qt )$ \\ \hline 1 ounce (oz) $=28.35$ grams (g) & 1 cubic foot $\left( ft ^3\right)=7.481$ gallons (gal) \\ \hline 1 pound $( lb )=0.454$ kilograms (kg) & 1 liter $( L )=1000$ milliliters (mL) \\ \hline & 1 cubic meter $\left(m^3\right)=1000$ liters (L) \\ \hline & 1 gallon $( gal )=3.785$ liters (L) \\ \hline & 1 fluid ounce (fl oz) = 29.574 milliliters ( mL ) \\ \hline \end{tabular}

[Done] Find the 9th term of the geometric sequence $7, 14, 28, \ldots$

[Done] What is the mean of the following set of numbers? $18, 12, 15, 17, 14, 11, 17, 14$ Stephen scored the following points in an online game: $122, 145, 144, 168, 125$ and $142$. What is his average score?

[Done] Define the subject of this question using one of the following options: Mathematics, History, English, Biology, Chemistry, Physics, Social Studies, Advanced Placement (AP), SAT, Geography, Health, Arts, Business, Computers and Technology, French, German, Spanish, World Languages, Medicine, Law, Engineering. Define the grade of this question using one of the following options: Middle School, High School, College.

[Done] Select the correct answer. Express the terms of the following sequence by giving an explicit formula [tex]$9,12,15,18,21, \ldots$[/tex] A. [tex]$u(n)=6+3 n$[/tex], where [tex]$n=1,2,3,4, \ldots$[/tex] B. [tex]$u(n)=n+3$[/tex], where [tex]$n=1,2,3,4, \ldots$[/tex] C. [tex]$u(n)=3+n$[/tex], where [tex]$n=1,2,3,4 \ldots$[/tex] D. [tex]$u(n)=3 n$[/tex], where [tex]$n=1,2,3,4, \ldots$[/tex]

[Done] Write two addition equations that each have a sum of -21.5

[Done] Select the correct answer. Which expression is equivalent to the given expression? [tex]$(3 y-4)(2 y+7)+11 y-9$[/tex] A. [tex]$6 y^2+11 y+19$[/tex] B. [tex]$16 y-6$[/tex] C. [tex]$9 y-37$[/tex] D. [tex]$6 y^2+24 y-37$[/tex]