Sally receives a $7,000 gift from her grandmother before going to college. before leaving she places a down payment on her classes of $500 and then spends $400 dollars a month while at school. write a function that models the amount she has in the bank per month while she is at college where y is the money in her account and x is the number of months she attends college.

a) y=400x+6500

b) y=−400x+7000

c) y=−400x+6500

d) y=500x+6500

found it xd it ok yt

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!