4 years ago

HELP PLEASE,

Mathematics

2 answers:

faltersainse [42]4 years ago

7 0

I think it's D but make it sire

nekit [7.7K]4 years ago

6 0

Direct variation is y=kx where k is a constant
we see it is x times 5
so y=5x

answer is C

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Which two values of x are roots of the polynomial below?<br> x2 + 5x+7

Dmitry [639]

Answer:

The roots are

$x=\frac{-5+i\sqrt{3}}{2}$ and $x=\frac{-5-i\sqrt{3}}{2}$

Step-by-step explanation:

we have

$x^{2} +5x+7$

To find the roots equate the polynomial to zero and cmplete the square

$x^{2} +5x+7=0$

$x^{2} +5x=-7$

$(x^{2} +5x+2.5^{2})=-7+2.5^{2}$

$(x^{2} +5x+6.25)=-0.75$

rewrite as perfect squares

$(x+2.5)^{2}=-0.75$

take square root both sides

$(x+2.5)=(+/-)\sqrt{-\frac{3}{4}}$

Remember that

$i=\sqrt{-1}$

substitute

$(x+2.5)=(+/-)i\sqrt{\frac{3}{4}}$

$(x+\frac{5}{2})=(+/-)i\frac{\sqrt{3}}{2}$

$x=-\frac{5}{2}(+/-)i\frac{\sqrt{3}}{2}$

therefore

The roots are

$x=\frac{-5+i\sqrt{3}}{2}$

$x=\frac{-5-i\sqrt{3}}{2}$

4 0

3 years ago

Mr. johnson has a 3 liter container of glue. How many glue bottles can be fill if each bottle holds 75 millimeters

ollegr [7]

3L = 3000ml
3000ml/ 75
=40 bottles

4 0

3 years ago

The price of a tent was decreased by 15% and sold for $76.49. What was the original price of the tent in dollars?

kicyunya [14]

Idk toooo hard !!!!!

3 0

4 years ago

Read 2 more answers

Rewrite 3/9 as a mixed number

Daniel [21]

3/9 is already a fraction, you do not need to change it. 3/9 is not more than 9/9

4 0

4 years ago

Read 2 more answers

H E L P ! !

mihalych1998 [28]

Answer:

10.7cm

Step-by-step explanation:

x^2= 115

x = √115

x = 10.7

5 0

3 years ago