<span>13 more than 4 times a number is negative 91

</span>Convert to numbers:

13 more than 4: 4+13

times a number: (x)

is negative 91: = -91

Put it together:

4x+13=-91

x = -26

5 0

4 years ago

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In a class of 23 students, 9 play an instrument and 7 play a sport. There are 3

Andre45 [30]

Answer:

4/7

Step-by-step explanation:

4 0

3 years ago

Which shows the correct substitution of the values a, b, and c from the equation -2=-x+x^2-4 into the quadratic formula?

Greeley [361]

Given the equation:

(1) $-2=-x+ x^{2}-4$

We need to find a, b and c. So, we know that a quadratic equation is given by:

(2) $ax^{2}+bx+c=0$

Then, we need to order the equation (1) and to adjust it to the equation (2), so:

$x^{2}-x-2=0$

So, if we compare these two equations, the conclusion is:

$a=1$
$b=-1$
$c=-2$

(3) $x= \frac{-b\pm \sqrt{b^{2}-4ac}}{2a}$

Substituiting a, b and c into (3):

$x= \frac{-(-1)\pm \sqrt{(-1)^{2}-4(1)(-2)}}{2(1)}$

Finally, the results are two values:

$x_{1}=2$
$x_{2}=-1$

7 0

3 years ago

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