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3 years ago

If f(x) = -x+7, what is f(15)? (I got -8, which was incorrect) Thanks!

Mathematics

2 answers:

HACTEHA [7]3 years ago

5 0

Im not sure why you said ur wrong b/c i got the same answer
f(x) = -15+ 7
f(x) = -8

Vilka [71]3 years ago

4 0

Answer: $f(15)=-8$

Step-by-step explanation:

The given function : $f(x)-x+7$

To find $f(15)$ , we need to substitute the value of x=15 in the given function ,so that we have

$f(15)=-15+7\\\\\Rightarrow\ f(15)=-8$

Therefore the value of the given function $f(x)-x+7$

at $x=15 \text{ is}-8$ i.e. $f(15)=-8$

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The diffrence between 2 numbers is 1 and their product Is 132

il63 [147K]

Answer:

x = 12

y = 11

For any clarification, Please contact me in the comment section :)

I Hope It Helps .

Step-by-step explanation:

$Let -the-unkonown- numbers-be-x-and-y \\x-y = 1 (1)\\xy = 132 (2)\\Make-x-subject-of-formula-in-equation1 \\x = 1+y\\Substitute , 1+y for- x -in -equation ,2\\y(1+y) = 132\\y + y^{2} =132\\y^{2} +y-132=0\\Solve- the-quadratic-equation.\\y = 11\\substitute- 11 -for- y- in- equation -1- 0r- 2\\x -y = 1\\x-11 = 1\\x = 1+11\\x = 12$

6 0

3 years ago

PLEASE HELP ASAP NO VIS!

Wittaler [7]

Theoretical probability is data from our experiment , Experimental is our prediction

7 0

3 years ago

Atmospheric pressure decreases by about 11.8% for every 1000 meters you climb. The pressure at sea level is 1013 millibars (a un

erica [24]

At sea level, the pressure is 1013, that's when the altitude is at 0, sea level, let's see

$\bf \textit{Periodic Exponential Decay}\\\\
A=I(1 - r)^{\frac{t}{p}}\qquad 
\begin{cases}
A=\textit{accumulated amount}\to &1013\\
I=\textit{initial amount}\\
r=rate\to 11.8\%\to \frac{11.8}{100}\to &0.118\\
t=\textit{meters climbed}\to &0\\
p=period\to &1000
\end{cases}
\\\\\\
1013=I(1-0.118)^{\frac{0}{1000}}\implies 1013=I\cdot 1\implies 1013=I$

so, the inital amount is 1013, when t = 0,

$\bf \textit{Periodic Exponential Decay}\\\\
A=I(1- r)^{\frac{t}{p}}\qquad 
\begin{cases}
A=\textit{accumulated amount}\\
I=\textit{initial amount}\to &1013\\
r=rate\to 11.8\%\to \frac{11.8}{100}\to &0.118\\
t=\textit{meters climbed}\to &t\\
p=period\to &1000
\end{cases}
\\\\\\
A=1013(1-0.118)^{\frac{t}{1000}}\implies A=1013(0.882)^{\frac{t}{1000}}$

now, to check the atmospheric pressure at 4000, simply set t = 4000, to get A.

7 0

3 years ago

Find the unknown angle measured

grandymaker [24]

B= 121
A= 59
C= 59
I hope this helps!

5 0

2 years ago

Read 2 more answers

A cylinder has a radius of 12 m and a height of 8 m. What is the approximate surface area of the cylinder? Use 3.14 for π. Use y

____ [38]

Answer:

1507m²

Step-by-step explanation:

Given parameters:

Radius of cylinder = 12m

Height of cylinder = 8m

π = 3.14

Unknown:

Surface Area of cylinder = ?

Solution:

The surface area of any body is the sum of all the area that covers a body.

For a cylinder, the surface area is given as;

SA = 2πr² + 2πrh

Where SA = Surface Area

r = radius of cylinder

h = height of cylinder

Now input the parameters in the given equation and solve;

SA = (2 x 3.14 x 12²) + (2 x 3.14 x 12 x 8)

SA = 904.32‬ + 603.264‬

SA = 1507.584‬m² = 1507m²

4 0

2 years ago

Read 2 more answers