Which of these systems of linear equations has an infinite number of solutions?
a) 5x-2y=10
10x-4y=12
b) 5x-2y=10
12x-4y=20
c) 5x-2y=10
10x-4y=20
d) 5x-2y=10
12x-4y=10

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

Consider circle c with angle acb measuring 3/4 radians.if minor arc ab measures 9 inches, what is the length of the radius of circle c? if necessary, round your answer to the nearest inch.