There are 12 math classrooms. Each classroom needs 2 pencil sharpeners. Each pencil sharpener costs $2.45, including tax. How much does it cost to purchase enough pencil sharpeners for the math classroom? *

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

What is the slope of the equation y =

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.