If the diameter of a sphere is doubled its surface becomes?

area will be four times the first area

Step-by-step explanation:

the diameter of the first sphere=d

therefore radius=d/2

=r

the diameter of the second sphere becomes 2d

therefore the radius of second sphere=2r

area of a sphere=4×pi×r^2

the ratio of the two spheres=(4pi(2r)^2)/(4pir^2)

=(4pi4r^2)/4pir^2

cancelling 4pir^2, you get 4:1

therefore the area of the second sphere is 4 times the first one

a. -0.3 > -0.33

answer: an 8-foot rope is tied from the top of a pole to a

stake in the ground, as shown in the diagram

below

step-by-step explanation: