This diagram is a straightedge and compass construction.
Select all true statements.
Line E F is the bisector of angle BAC.
Line E F is the perpendicular bisector of segment BA.
Line E F is the perpendicular bisector of segment AC.
Line E F is the perpendicular bisector of segment BD.
Line E F is parallel to line CD.
Please help

i believe it's a.

i'm not sure on this one, most likely correct.

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!