Eryn is calculating the height of the St Louis Arch using trigonometry.  She is standing ½ mile
away from the Arch and her eyes, which are exactly 5 feet above the ground,
make a 13.3 degree angle with the horizontal. 
How tall is the Arch in feet?
1 mile = 5280 feet
Make a good drawing...

Find the greatest common factor of 28 and 35

Can you decompose the numbers 20,740,6,000

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¯¯¯¯¯¯¯¯)?