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2 years ago

Find f(-5) f(x) = -4x + 3

Mathematics

2 answers:

Marina CMI [18]2 years ago

4 0

For this case we have a function of the form $y = f (x)$

Where:

$f (x) = - 4x + 3$

We must find the value of the function when the variable x is -5.

Then, substituting, $x = -5$

$f (-5) = - 4 (-5) +3$

We have that by sign law $- * - = +$

$f (-5) = 20 + 3\\f (-5) = 23$

Answer:

$f (-5) = 23$

OLEGan [10]2 years ago

4 0

ANSWER

$f( - 5)=23$

EXPLANATION

The given function is

$f(x)=-4x+3$

To find f(-5), we substitute x=-5 to obtain;

$f( - 5)=-4( - 5)+3$

We multiply out to obtain:

$f( - 5)=20+3$

We simplify to get,

$f( - 5)=23$

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B) The number of volume of a cylinder is half of its number of the total surface area.

faust18 [17]

Answer:

$V=179.6cm^3$

Step-by-step explanation:

the volume of a cylinder is given by:

$V=\pi r^2h$

where r is the radius and h is the height.

and the surface area:

$SA=2\pi r^2+2\pi rh$

the first term is the area of the circles and the second term is the area of the body.

since "The number of volume of a cylinder is half of its number of the total surface area." we will have that:

$V=\frac{1}{2}SA$

substitutig the equivalent expressions on each side:

$\pi r^2 h = \frac{1}{2} (2\pi r^2+2\pi r h)$

and we simplify and solve for the height (since is the value we don't know of the cylinder):

$\pi r^2 h = \pi r^2+\pi r h\\\pi r^2h-\pi rh=\pi r^2\\h(\pi r^2-\pi r)=\pi r^2\\h=\pi r^2/(\pi r^2-\pi r)$

we substitute the value of the radius $r=7cm$ , and we get:

$h=\pi (7cm)^2/(\pi (7cm)^2-\pi (7cm))\\h=153.938/(153.938-21.991)\\h=153.938/131.947\\h=1.1666cm$

thus the volume is:

$V=\pi r^2h$

$V=\pi (7cm)^2(1.1666cm)\\V=179.6cm^3$

3 0

2 years ago

Read 2 more answers

I need help ASAP please

Anna007 [38]

I can’t see the question

7 0

2 years ago

The Area of a square at right is 72 square units Find the value of X, <br>Did I do this right?

Assoli18 [71]

Yes, your work is correct.

The diagram does illustrate x²+6x+9=72. This is also represented by

(x+3)² = 72

We can take the square root of both sides:
$\sqrt{(x+3)^2}=\sqrt{72}
\\
\\x+3=\pm 6 \sqrt2
\\
\\x+3-3=\pm 6 \sqrt{2} -3
\\
\\x=-3\pm 6\sqrt{2}$

When we evaluate this, the answers are x = -11.5 or x = 5.5.

5 0

2 years ago

Help me please!! first write the subtraction with a common denominator then subtract

tatiyna

Answer:

hope it helps you

Step-by-step explanation:

pls kindly mark it brainliest answer