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Three coins are flipped. what is the probability that there will be at least two tails?

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9