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3 years ago

Explain how to use a graph of the function f(x) to find f(3).

Mathematics

2 answers:

meriva3 years ago

5 0

Answer:

For a function determining if it is a function or not is if they have two of the same x values it’s not a function if they don’t it is a function

Step-by-step explanation:

7nadin3 [17]3 years ago

5 0

Answer:

For f(3), the input is 3 and you are looking for the output.

To determine the function's value when x = 3, go to the value of 3 on the x-axis and then locate a point on the graph for that value of x.

Determine the value of y from the y-axis at that location on the graph.

Step-by-step explanation:

das all you need

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Decide whether the relation defines a function.

diamong [38]

Answer:

Step-by-step explanation:

Lets first solve the relation for "y". Shown below:

$3x=9-4y\\4y=-3x+9\\y=-\frac{3}{4}x+\frac{9}{4}$

This is clearly an equation of a line in the form $y=mx+c$

It will be a negatively sloped line, when graphed.

We can use vertical line test to determine function or relation. If a vertical line passes through only 1 point in the graph, we say that it is a function.

Think of a negatively sloped line. No matter where you draw a vertical line, it will only cut the line at 1 point.

So, this is definitely an equation of a function

Correct answer is A

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2 years ago

In a class there are

Inga [223]

Answer:

Step-by-step explanation:

3 0

2 years ago

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5cosx -2sin(x/2) +7=0<br>Help me to find x step by step<br>pls

miskamm [114]

Answer:

x = 180

Step-by-step explanation:

First, you need to know

1. Double-angle formula:

cos(2x) = $cos^{2}x - sin^{2}x$

2. Pythagorean identity:

$cos^{2}x + sin^{2}x = 1$

Back to your problem, replacing the variable by the above:

$5cosx-sin\frac{x}{2}+7 = 0$

$5(cos^{2}\frac{x}{2}-sin^{2}\frac{x}{2}) - 2sin\frac{x}{2} + 7 = 0$ By Double-angle formula

$5(1 - 2sin^{2}\frac{x}{2}) - 2sin\frac{x}{2} + 7 = 0$ By Pythagorean identity

Given $y = \frac{x}{2}$

$5(1-2sin^{2}y) - 2siny + 7 = 0$

$10sin^{2}y+2siny-12=0$

$5sin^{2}y+siny-6=0$

$(5siny + 6)(siny - 1)=0$ , we know -1 < sinx < 1, for every x ∈ R

$siny = 1, y =90$

$y = \frac{x}{2}$

$x = 180$

8 0

2 years ago

Is 21 3/7 a rational or an irrational number?

igor_vitrenko [27]

Answer:

Rational

Step-by-step explanation:

This number is rational because it can be expressed as a ratio between two numbers.

3 0

2 years ago

Find the area of the circle. Round your answer to the nearest hundredth.

soldi70 [24.7K]

Answer:

50.27

Step-by-step explanation:

area of a circle: pi X r^2

r= radius

6 0

3 years ago

Read 2 more answers