If 3 pounds of fruit serve 7 people how many pounds of fruit serve 21 people

9 people

Step-by-step explanation:

We can use a ratio to solve

3 lbs          x lbs

   =

7 people     21 people

Using cross products

3 *21 = 7x

63 = 7x

Divide by 7

63/7 = 7x/7

9 =x

9 pounds of fruits serve 21 people

Step-by-step explanation:

3 pounds = 7 people

x pounds = 21 people

Using cross multiplication method

3 × 7 = 7 × x

multiply

63 = 7 x.

Divide each side by 7

63 / 7 = 7 x / 7

9 = x

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!