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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Valentino starts with a population of 1,500 amoebas that increases 35% in size every hour for a number of hours, h. the expression 1,500(1+0.35)h finds the number of amoebas after h hours. which statement about this expression is true? a. it is the initial population raised to the growth factor after h hours. b. it is the sum of the initial population and the percent increase. c. it is the sum of the initial population and the growth factor after h hours. d. it is the product of the initial population and the growth factor after h hours.

Joe has a rectangular chicken coop. the length of the coop is 4 feet less than twice the width. the area of the chicken coop is 510 square feet. what is the length of the chicken coop?

Which one ? is the answer and how to find this answer