Chen buys 4 notebooks and 3 pens for $17.50 . Liu buys 2 notebooks and 5 pens for $14. Form a pair of simultaneous equations and solve them to find the cost of a notebook and the cost of a pen.
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In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

What is the volume of a cone with a height of 6 cm in the radius of 2 cm

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.