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

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

answer:

step-by-step explanation:

here, the total dishes = 10

dishes having meat = 3 ( chicken, meatloaf and hamburger )

thus, the probability of having meat on the chosen dishes = number of dishes having meat / total dishes

=

therefore, the probability of not having meat = 1- the probability of having meat on the chosen dishes

=

=

=

⇒ option b is correct.