Questions in mathematics

Questions in mathematics

📝 Answered - Which is equivalent to [tex]$P (z \geq 1.4) ?$[/tex] [tex]$\begin{array}{l} P(z \leq 1.4) \ 1-P(z \leq 1.4) \ P(z \geq-1.4) \end{array}$[/tex]

📝 Answered - Solve [tex]|2x+7|=5[/tex] for [tex]x[/tex]. A. [tex]x=-6,1[/tex] B. [tex]x=-1,6[/tex] C. [tex]x=-1[/tex] D. [tex]x=-6,-1[/tex] E. all real numbers F. no solution

📝 Answered - What is the true solution to the logarithmic equation? [tex]g_2[\log _2(\sqrt{4 x})]=1[/tex] A. [tex]x=-4[/tex] B. [tex]x=0[/tex] C. [tex]x=2[/tex] D. [tex]x=4[/tex]

📝 Answered - Solve the system by substitution. [tex]\begin{array}{c} 9 x+3 y=-30 \\ -5 x=y \end{array}[/tex]

📝 Answered - Determine and show graphically the solution set of each of the following inequalities: (a) [tex]$2-x-x^3 \geq 0$[/tex] (b) [tex]$9-x^3\ \textgreater \ 0$[/tex] (c) [tex]$3+x-2 x^3 \geq 0$[/tex] (d) [tex]$2-3 x-9 x\ \textgreater \ 0$[/tex]

📝 Answered - In January 2008, the temperature in parts of Minnesota fell from $41^{\circ} F$ to $-13^{\circ} F$ over a 24-hour period. What was the average temperature change per hour?

📝 Answered - Solve [tex]x-\frac{1}{4}=\frac{1}{2}[/tex] for [tex]x[/tex]. A. [tex]x=\frac{1}{4}[/tex] B. [tex]x=\frac{3}{6}[/tex] C. [tex]x=\frac{3}{4}[/tex] D. [tex]x=\frac{5}{8}[/tex]

📝 Answered - By rounding to 1 significant figure, estimate the answers to these questions: a) $17 \times 82$ b) $54 \times 671$ c) $207 \times 643$

📝 Answered - Select the correct answer. What is the solution to this equation? [tex]2\left(\frac{1}{49}\right)^{x-2}=14[/tex] A. 3 B. [tex]\frac{3}{2}[/tex] C. [tex]\frac{5}{2}[/tex] D. [tex]-\frac{5}{2}[/tex]

📝 Answered - Solve the system for $x$ and $y$. $\begin{array}{l} -8 x-5 y=-1 \\ -5 x-y=-45 $\end{array} a. $(12,-19)$ b. $(7,-11)$ c. $(6,3)$ d. $(2,3)$