Find the circumference and the area of a circle with diameter 8 yd. Use the value 3.14 for n, and do not round your answers. Be sure to include the correct units in your answers.

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¯¯¯¯¯¯¯¯)?

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

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