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Snezhnost [94]
3 years ago
10

Need help with this!

Mathematics
1 answer:
Alona [7]3 years ago
6 0

Answer:

a=11

Step-by-step explanation:

Let's solve your equation step-by-step.

√a+5=4

Solve Square Root.

√a+5=4

a+5=42(Square both sides)

a+5=16

a+5−5=16−5(Subtract 5 from both sides)

a=11

Check answers. (Plug them in to make sure they work.)

a=11(Works in original equation)

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On the graph of f(x)=cos x and the interval [0,2π), for what value of x does f(x) achieve a minimum?
Mariulka [41]

Answer:

cos(\pi)=-1

Step-by-step explanation:

f(x)=cos (x)

State that the values where cos x is minimum:

x=\pi +2\pi n, n\in \mathbb{Z}

cos(0)=1\\

$cos\left(\frac{\pi}{4} \right)=\frac{\sqrt{2} }{2} $

$cos\left(\frac{\pi}{2} \right)=0 $

cos(\pi)=-1

$cos\left(\frac{3\pi}{2} \right)=0 $

7 0
3 years ago
What is the value of z?
UNO [17]

Answer:

z =23

Step-by-step explanation:

The three angles in a triangle add to 180 degrees.

62+95+z = 180

Combine like terms

157 +z = 180

Subtract 157 from each side

157-157 +z = 180-157

z =23

3 0
3 years ago
Which expression is a sum of cubes?
luda_lava [24]
   
-27x^9+y^6 = (-3)^3\times \Big(x^3\Big)^3 + \Big(y^2\Big)^3=\boxed{\Big(-3x^3\Big)^3+\Big(y^2\Big)^3}



5 0
3 years ago
Read 2 more answers
Help with num 9 please. thanks​
Alik [6]

Answer:

See Below.

Step-by-step explanation:

We want to show that the function:

f(x) = e^x - e^{-x}

Increases for all values of <em>x</em>.

A function is increasing whenever its derivative is positive.

So, find the derivative of our function:

\displaystyle f'(x) = \frac{d}{dx}\left[e^x - e^{-x}\right]

Differentiate:

\displaystyle f'(x) = e^x - (-e^{-x})

Simplify:

f'(x) = e^x+e^{-x}

Since eˣ is always greater than zero and e⁻ˣ is also always greater than zero, f'(x) is always positive. Hence, the original function increases for all values of <em>x.</em>

8 0
3 years ago
0.8x = 12. Solve for X. PLEASEEE HELPPP!!
kenny6666 [7]

Answer:

x-15

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
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