The formula for the circumference of a circle is C = 2nr. If the circumference is 31.4 cm, what is the diameter of the circle? (let i = 3.14)
A. 10 cm2
B. 5 cm
C. 10 ft
D. 5 ft
E. 10 cm

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 number is 7 units left of -15?

Which function is shown on the graph?