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mylen [45]
3 years ago
6

Please, someone help? ​

Mathematics
1 answer:
anzhelika [568]3 years ago
4 0

Answer:

x = -5 + \sqrt{26}

Step-by-step explanation:

f(x) = x² + 10x - 1

        x² + 10x = 1

        x² + 10x + 25 = 1 + 25

        (x + 5)² = 26

take the square root of each side to get:

        x + 5 = √26

        x = √26 - 5  or -5 + √26

       

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Which is the wrong one? BIGGER OR SMALLER <br><br> help
harina [27]

Answer:

It's D. 1.2(line) < 3.1(pi) < 4.6(square root 22)

Step-by-step explanation:

Look in the comments to figure out why D is correct. You're welcome! :)

7 0
3 years ago
He loudness of a pile driver is 112 dB. About how many times the sound intensity of the jackhammer is the sound intensity of a p
chubhunter [2.5K]

Complete question :

The loudness of a jack hammer is 96 dB. Its sound intensity is about 0.004.

The loudness of a compactor is 94 dB. Its sound intensity is about 0.0025.

The sound intensity of the jack hammer is about 1.6 times the sound intensity of the compactor.

The loudness of a pile driver is 112 dB. About how many times the sound intensity of the jackhammer is the sound intensity of a pile driver? Round to the nearest ten.

Answer:

40

Step-by-step explanation:

Given that:

Sound intensity of jackhammer = 0.004

Sound intensity of compactor = 0.0025

Sound intensity of jackhammer is about 1.6 times the sound intensity of a compactor

Each factor of 10 in intensity corresponds to 10dB

Pile driver with loudness of 112dB ; 112 / 10 = 11.2

Hence, 10^11.2 = 1.58489 * 10^11

Hence, sound intensity (I) in watts per m²

I = 1.58489 * 10^11 * 10^-12

I = 1.58489 * 10-1

I = 0.158489

Comparing the intensity of pile driver and jackhammer :

Intensity of piledriver / Intensity of jackhammer

0.158489 / 0.004

= 39.622

= 40 (nearest ten)

3 0
3 years ago
Read 2 more answers
A car can be rented for $50 per week plus $0.75 per milo. How many miles can be driven if you have at most $140 to spend for woo
avanturin [10]

Answer: 120 Miles

Step-by-step explanation:

We start with $140.

The initial payment is $50.  

$140 - $50 = $90

We now have $90 dollars to spend on miles.

$90/$0.75 per mil = 120 Miles

Using the remaining $90 we can drive 120 miles in a week.

7 0
3 years ago
Which function below is the inverse of f(x)=x^2-36
Artyom0805 [142]

Answer:

+- square root of x+36

Step-by-step explanation:

f(x) = x^2 -36

y = x^2 -36

Exchange x and y

x = y^2 -36

Solve for y

Add 36 to each side

x+36 = y^2 -36+36

x+36 = y^2

Take the square root of each side

±sqrt(x+36) = y

±sqrt(x+36) = f^-1(x)

3 0
3 years ago
Solve the equation: Show work step by step<br><br> -14=-5+3c
arsen [322]
-14 = -5 + 3c

First, regroup your terms. / Your problem should look like: -14 = 3c - 5
Second, add 5 to both sides. / Your problem should look like: -14 + 5 = 3c
Third, simplify -14 + 5 to -9. / Your problem should look like: -9 = 3c
Fourth, divide both sides by 3. / Your problem should look like: -\frac{9}{3} = c
Fifth, simplify the fraction to 3. / Your problem should look like: -3 = c
Sixth, switch your sides. / Your problem should look like: c = -3

Answer: c = -3

3 0
3 years ago
Read 2 more answers
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