Questions in mathematics

Questions in mathematics

📝 Answered - Simplify: $(3 x-4)(7 x+2)$ A. $10 x-2$ B. $21 x^2-22 x-8$ C. $21 x-8$ D. $21 x^2-5 x-8$

📝 Answered - Which statement explains why the value of $\lfloor 2.4\rfloor$ is 2 but the value of $\lfloor-2.4\rfloor$ is -3? A. because 2 is the greatest integer not greater than 2.4, and -3 is the greatest integer not greater than -2.4 B. because 2.4 rounds to 2, and -2.4 rounds to -3 C. because 2.4 is positive, and -2.4 is negative D. because 2 is the least integer greater than 2.4, and -3 is the least integer greater than -2.4

📝 Answered - Solve the following system of equations algebraically: [tex]$30 x+44 y=15$[/tex] [tex]$40 x+55 y=13$[/tex]

📝 Answered - If [tex]$\lambda x^2-10 x y+12 y^2+5 x-16 y-3=0$[/tex] represents a pair of straight lines, the value of [tex]$\lambda$[/tex] is: a) -1 b) -3 c) -3 d) -7

📝 Answered - Multiply $(5 x-4)(x+y)$ a. $5 x^2+5 y-4 x-4 y$ b. $5 x^2+5 x y-4 x-4 y$ c. $5 x-4 x y-y$ d. $5 x+x y-4 x-4 y$

📝 Answered - From the list of numbers $\left{\frac{22}{2},-25,(-22)^2, \frac{0}{4}, \frac{12}{0}\right}$, which are the whole numbers? A. $\left{\frac{22}{2}, \frac{12}{0}\right}$ B. $\left{-25, \frac{0}{4},(-22)^2\right}$ C. $\left{\frac{22}{2}, \frac{12}{0}, \frac{0}{4},(-22)^2\right}$ D. $\left{\frac{22}{2}, \frac{0}{4},(-22)^2\right}$

📝 Answered - Complete the point-slope equation of the line through $(8,-8)$ and $(9,8)$. Use exact numbers. $y-8=$ $\square$

📝 Answered - The average adult heart pumps about [tex]$84 . mL / s$[/tex] of blood at 72 beats per minute. Suppose you need to calculate how long it would take the average heart to circulate [tex]$7400 . mL$[/tex] of blood. Set the math up, but don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols. [tex]time=[/tex]

📝 Answered - What is the true solution to the logarithmic equation? $\log _2\left[\log _2(\sqrt{4 x})\right]=1$ A. $x=-4$ B. $x=0$ C. $x=2$ D. $x=4$

📝 Answered - Solve the system of inequalities: $y+2 x>3$ and $y \geq 3.5 x-5$ The first inequality, $y+2 x>3$, is $\square$ in slope-intercept form. The first inequality, $y+2 x>3$, has a $\square$ boundary line. The second inequality, $y \geq 3.5 x-5$, has a $\square$ boundary line. Both inequalities have a solution set that is shaded $\square$ their boundary lines. $\square$ is a point in the solution set of the system of inequalities.