Factor completely 16x^2 + 40x + 25

A: (4x-5)(4x-5)
B: (2x-5)(2x-5)
C: (2x+5)(2x+5)
D: (4x+5)(4x+5)

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 f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.