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Questions in Grade College

[Free] Solve the system of linear equations: $\begin{array}{l} \frac{1}{4} x+\frac{1}{5} y=1 \\ \frac{1}{8} x-\frac{1}{8} y=1 \\ x=-12 \\ y=20 \end{array}$

[Free] One who has demonstrated the skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to identify and avoid the hazards involved is known as a: A. Polychlorinated biphenyls (PCBs) B. Error precursors C. Grounded tool D. Double-insulated/ungrounded tools E. Qualified person F. Fibrillation G. Ground fault circuit interrupter (GFCI)

[Free] Which two things have the MOST weight in the composition of a credit score? A. Length of credit history and debt level B. Credit inquiries and mix of credit C. Payment history and debt level

[Free] Which statement below correctly describes White ownership of slaves in the South? A. Most White Southerners owned slaves, since slaves were plentiful and inexpensive to purchase. B. In addition to White men, White women also owned slaves, with women purchasing slaves for domestic work. C. The total number of slaveowners was only about 400,000 out of a total White population of some 8 million. D. Only White men of the planter class owned slaves, using them on large plantations. E. Slave ownership was limited by law in most states to a maximum of twenty slaves per White owner.

[Free] A parabola can be represented by the equation $x^2=2 y$. What are the coordinates of the focus and the equation of the directrix? A. focus: $(0,8)$; directrix: $y=-8$ B. focus: $\left(0, \frac{1}{2}\right)$; directrix: $y=-\frac{1}{2}$ C. focus: $(8,0)$; directrix: $x=-8$ D. focus: $\left(\frac{1}{2}, 0\right)$; directrix: $x=-\frac{1}{2}$

[Free] Bruce wants to make 50 ml of an alcohol solution with a $12 \%$ concentration. He has a $10 \%$ alcohol solution and $15 \%$ alcohol solution. The equation $0.10 x+0.15(50-x)=0.12(50)$ can be used to find the amount of $10 \%$ alco solution Bruce should use. How much of the $10 \%$ alcohol solution should Bruce use? $\square$ mL How much of the $15 \%$ alcohol solution should Bruce use? $\square$ mL

[Free] The length of a rectangular field is represented by the expression [tex]$14 x-3 x^2+2 y$[/tex]. The width of the field is represented by the expression [tex]$5 x-7 x^2+7 y$[/tex]. How much greater is the length of the field than the width? A. [tex]$9 x+4 x^2-5 y$[/tex] B. [tex]$9 x-10 x^2-5 y$[/tex] C. [tex]$19 x+4 x^2+9 y$[/tex] D. [tex]$19 x-10 x^2+9 y$[/tex]

[Free] Which of the following countries is NOT in the Kurdish ethnolinguistic region?

[Free] You find yourself in a situation with reduced visibility due to fog. There is a car 100m in front of you. Which lights can you use? A. Indicators. B. Fog lights. C. Headlights. D. High beams. Hint: You must select ALL correct answers.

[Free] Simplify: $(\sqrt{25}-4)^3 \cdot 5$