Complete the recursive formula of the arithmetic sequence -1, -13, -25, -37 a ( 1 ) =
a ( n ) = a ( n-1 ) +

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¯¯¯¯¯¯¯¯)?

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

How can you tell when x and y are not directly proportional?