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oksano4ka [1.4K]

2 years ago

13

Is the following relation a function?

1 answer:

professor190 [17]2 years ago

7 0

Answer:

Yes.................

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Solve.<br> -5x^2+9+7x = 0−5x <br> 2<br> +9+7x=0

Lynna [10]

Answer:

x = $\frac{-7 \frac{+}{} \sqrt{229} }{-10}$ , or x=2.21327 and -0.81327

Step-by-step explanation:

$-5x^2+7x+9 = 0$

see if equation is factor-able:

$\left[\begin{array}{ccc}?&9\\-5x^2&?\\\end{array}\right]$

the two ? must multiply together to $-45x^2$ and add up to 7x

no two integers times x can solve, so we must use quadratic equation

$x = \frac{-b \frac{+}{} \sqrt{b^2-4ac} }{2a}$ , given a quadratic $ax^2 +bx +c$

so

$x = \frac{-7 \frac{+}{} \sqrt{49+180} }{-10} = \frac{-7 \frac{+}{} \sqrt{229} }{-10}$

5 0

3 years ago

What is the value of 3-(2/3) cubed 2

Scilla [17]

Answer:

2.77777778

2/3 cubed is 0.222222222 and 3-2/3^2 is 2.77777778

8 0

3 years ago

What is the Y-intercept ??

riadik2000 [5.3K]

The Y intercept is (0,2) so you were correct in your answer

6 0

3 years ago

How would I start to solve number 15? Would I use distributive property?

natita [175]

$-5-x=2x-(4x+6)$

Using the distributive property is the correct first step. $(4x+6)$ is being multiplied by -1, so distributing gives

$-5-x=2x+(-4x-6)$
$-5-x=2x+((-4x)+(-6))$

Now, using the associative property of addition, you get

$-5-x=(2x+(-4x))+(-6)$
$-5-x=(2x-4x)-6$

Simplify the right hand side:

$-5-x=-2x-6$

Add 5 and $2x$ to both sides.

$(2x+5)-5-x=(2x+5)-2x-6$

On the left side, use the associative property. On the right, commutativity and associativity:

$2x+(5-5)-x=5+(2x-2x)-6$

Simplify.

$2x-x=-1$
$x=-1$

8 0

3 years ago

357/40 mixed number I can't figure it out

Maksim231197 [3]

Answer: 8 37/40

Step-by-step explanation:

Divide 357 by 40!?

3 0

3 years ago