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3 years ago

Please help! I need help on this one!

Mathematics

1 answer:

gregori [183]3 years ago

8 0

Answer:

-4< (with line underneath) x <(with line underneath) 4

Step-by-step explanation:

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PLEASE HELP

Viefleur [7K]

7x²=9+x
so
for
0=ax²+bx+c

$x=\frac{-b+/-\sqrt{b^2-4ac}}{2a}$
so

7x²=9+x
mins 9 from both sides and minus x
7x²-1x-9=0
a=7
b=-1
c=-9

$x=\frac{-(-1)+/-\sqrt{(-1)^2-4(7)(-9)}}{2(7)}$
$x=\frac{1+/-\sqrt{(-1)^2+4(7)(9)}}{2(7)}$
so the 4th one

4 0

3 years ago

Simplify the following radicals. 1. √16 2. √17 3. √18 4. √19 5. √20

Pavel [41]

Answer:

Step-by-step explanation:

$1) \sqrt{16}= \sqrt{4*4}=4\\\\\\2) \sqrt{17}$

This is the simplest form as 17 is a prime number.

$3) \sqrt{18}= \sqrt{2*3*3} = 3 \sqrt{2}\\\\\\4) \sqrt{19}$

19 is a prime number. so it is the simplest form.

$5) \sqrt{20}= \sqrt{2*2*5}=2 \sqrt{5}$

3 0

3 years ago

Given that cos (x) = 1/3, find sin (90 - x)

ddd [48]

Answer:

$\sin(90^{\circ} - x)=\frac{1}{3}$

Step-by-step explanation:

Given: $\cos (x)=\frac{1}{3}$

We have to find the value of $\sin(90^{\circ} - x)$

Since Given $\cos (x)=\frac{1}{3}$

Using trigonometric identity,

$\sin(90^{\circ} - \theta)=\cos\theta$

Thus, for $\sin(90^{\circ} - x)$ comparing , we have,

$\theta=x$

We get,

$\sin(90^{\circ} - x)=\cos x=\frac{1}{3}$

Thus, $\sin(90^{\circ} - x)=\frac{1}{3}$

3 0

3 years ago

Read 2 more answers

Mrs. Gomez is a mother to 2 boys. The number of children she has is three times the number of boys she has. Her children are pla

slava [35]

There are 6 children total, 4 of which are girls. The ratio is 2:1 girls:boys, so there will need to be twice as many pinks as there are blues. If we get 12 pinks, then there will be 6 blues. That's the biggest since that's all the pinks the florist has.

3 0

3 years ago

Which is the quotient for 28/8? A. 0.25 B. 0.35 C. 3.25 D. 3.5

Marysya12 [62]

Answer:

D. 3.5

Step-by-step explanation:

28 divided by 8 = 3.5

4 0

2 years ago