Many utility companies promote energy conservation by offering discount rates to consumers who keep their energy usage below certain established subsidy standards. a recent epa report notes that 70% of the island residents of puerto rico hae reduced their electricity usage sufficiently to qualify for discounted rates. if five residential subscribers are randomly selected from san juan, puerto rico, find the probability of each of the following events.

a. all five qualify for the favorable rate
b. at least four qualify for the favorable rates

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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!