Find the digit that makes _ 3520 by 9

1 answer:

7 0

Remember the divisibility rule for 9. The sum of the digits of the number must be divisible by nine.
Let the digit be $x$ . Then $x+3+5+2+0=x+10$ has to be divisible by nine. Recalling that $18=9*2$ , we note that $x=8$ .

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What are the zeros of the function f(x)=-x^2+13x-36

Galina-37 [17]

For this case we have the following function:

$f (x) = - x ^ 2 + 13x-36$

To find the zeros of the function we make $y = 0$ and solve for "x", then:

$0 = -x ^ 2 + 13x-36$

We multiply by -1 on both sides of the equation:

$0 = x ^ 2-13x + 36$

We factor the equation, for this we look for two numbers that, when multiplied, result in 36 and when added, result in -13. These numbers are -9 and -4.

$(-9) * (- 4) = 36\\-9-4 = -13$