Which equation shows the quadratic formula used correctly to solve 7x2 = 9 + x for x?
-1+
((719)
2(7)
x-1
ox=--
(-1)-47)(9)
2(7)
-1 +
(-1)2 +4(7)(9)
2(7)
(-1)2 +4(7(9)
207)
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Compare the following pair of numbers a and b in three ways. a. find the ratio of a to b. b. find the ratio of b to a. c. complete the sentence: a is percent of b. a=120 and b=340 a. the ratio of a to b is . b. the ratio of b to a is . c. a is nothing percent of b.