What was the original number if after an increase of 40%, it became 420.

The number which becomes 420 after 40% increase. Hence, the original number is 300.

Step-by-step explanation:

Given information:

After increase of 40% the number becomes 420

Let , the original number is

So, according to the question:

We can write

Hence , the original number is 300.

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300

Step-by-step explanation:

Solve for x.

x+(2/5*x)=420

x=300

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.

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