A package of 12 pens costs $3.60. What is the cost per pen? Hint: how much does 1 pen cost?

Use the diagonals to determine whether a parallelogram with vertices u(2,−2), v(9,−2), w(9,−6), and x(2,−6) is a rectangle, rhombus, or square. give all the names that apply.

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

Solve the following inequalities and show the solution on a number line. 2x+3< 3(4x+5)