Questions in mathematics

Questions in mathematics

[Free] Select whether the equation has a solution or not. [tex]$\sqrt{y}-\sqrt{7}=\sqrt{y+7}$[/tex] A. roots B. no roots

[Free] If 12cm on a map represents 60km, what will be the length used to represent 400km on the map? A. 80cm B. 70cm C. 60cm D. 40cm

[Free] A cashier earns $7 an hour. If [tex]$x$[/tex] is the number of hours worked, which function represents the cashier's earnings? A. [tex]$y=7x$[/tex] B. [tex]$y=x^7$[/tex] C. [tex]$y=\frac{7}{x}$[/tex] D. [tex]$y=7$[/tex]

[Free] Which fractions have 20 as the LCD (lowest common denominator)? $\frac{2}{3}$ $\frac{5}{6}$ $\frac{7}{10}$ $\frac{1}{4}$ $\frac{3}{7}$

[Free] Which of the following does the y-axis on a data graph usually represent? A. The independent variable B. The dependent variable C. Both the dependent and independent variables D. Neither the dependent nor the independent variables

[Free] Find the average rate of change of [tex]g(x)=3 x^2-4 x[/tex] from [tex]x=3[/tex] to [tex]x=8[/tex]. Simplify your answer as much as possible.

[Free] If [tex]$x$[/tex] varies inversely as [tex]$y$[/tex] and [tex]$x=10$[/tex] when [tex]$y=15$[/tex], find the value of [tex]$y$[/tex] when [tex]$x=25$[/tex]. A. 6 B. [tex]$16^2 / 3$[/tex] C. 25 D. [tex]$371 / 2$[/tex]

[Free] A ball is kicked with an initial height of 0.75 meters and initial upward velocity of 22 meters/second. This inequality represents the time, [tex]$t$[/tex], in seconds, when the ball's height is greater than 10 meters. [tex]$-4.9 t^2+22 t+0.75>10$[/tex] The ball's height is greater than 10 meters when [tex]$t$[/tex] is approximately between seconds.

[Free] What is the solution of the system of linear equations? $\begin{array}{l} -3 x+4 y=-18 \\ 2 x-y=7 \end{array}$ A. $(-2,-3)$ B. $(-2,3)$ C. $(2,-3)$ D. $(2,3)$

[Free] [tex]\frac{2 a-2}{a-3}-\frac{a-3}{a-2}=\frac{a^2-8 a+27}{a^2-5 a+6}[/tex]