Find an expression in terms of radius r for the ratio of surface area to volume
for each of the following objects, given
that their volume is equal to that of the
sphere of radius r:
i A cube.
ii A cylinder with two half-spheres
attached at its bases, and height of
cylinder equal to five times the radius
of its base.
iii Hence, if the sphere has unit volume,
find how many times more surface
area each object will have than the
sphere.

x=12 units bd= 10 units

step-by-step explanation:

the correct option is:

b. a value of the variable that makes the polynomial equal to zero.

the root or roots of a polynomial are the values of the variable that makes the polynomial equal to 0. we can find the roots of a polynomial making the expression equal to 0 and then, isolating the variable (it it has just one variable).

for example, given the following polynomial:

the root or zero of the polynomial, can be found by making the expression equal to 0, and then, isolating the variable, so, finding the root we have:

therefore, we have that the root of the polynomial is equal to 2.

we must remember that the number of roots that a polynomial can have, will depend on the degree of the polynomial, a first degree polynomial have will have one single root, a second degree polynomial (quadratic expression) may have two roots and so.

hence the correct option is:

b. a value of the variable that makes the polynomial equal to zero.

have a nice day!