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3 years ago

If the function rule is 5x, what is the value when x=4

Mathematics

1 answer:

OleMash [197]3 years ago

6 0

20 will be the answer when x=4

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Help please???? f(4)=4²-5 show the "work"

Fynjy0 [20]

F(4) = 4^2-5
f(4) = 4x4-5
f(4) = 16-5
f(4) = 11

4 0

3 years ago

AysviL [449]

Answer:

168

Step-by-step explanation:

If he was faster than Don then it should've taken him less time. So Don would've taken 30 seconds MORE

138+30=168

5 0

3 years ago

Read 2 more answers

I WILL GIVE BRAINLIEST The fuel efficiency of Natalie's car is 25 miles per gallon. Which of the following statements are true?

sleet_krkn [62]

Answer:

The fuel efficiency of Natalie's car is 25 miles per gallon. Which of the following statements are true? Select two that apply.

a. For every mile Natalie travels, she uses 25 gallons.

b. For every gallon Natalie uses, she travels 0.04 miles.

✓c. For every mile Natalie travels, she uses 0.04 gallons.

✓d. For every gallon Natalie uses, she travels 25 miles.

C. and D. are the right answer.

8 0

3 years ago

What are all of the real roots of the following polynomial? f(x) = x^4 -24x^2 - 25 A. -1 or 1 B. -5 or 5 C. -5, -1, 1, or 5 D. -

professor190 [17]

For this case we have the following function:

$f (x) = x ^ 4-24x ^ 2-25$

We make a change of variable:

$u = x ^ 2$

So, we have:

$u ^ 2-24u-25$

We apply the resolver:

$a = 1\\b = -24\\c = -25\\$

$u = \frac {-b \pm \sqrt {b ^ 2-4 (a) (c)}} {2 (a)}\\u = \frac {- (- 24) \pm \sqrt {(- 24) ^ 2-4 (1) (- 25)}} {2 (1)}\\u = \frac {24 \pm \sqrt {576 + 100}} {2}\\u = \frac {24 \pm \sqrt {676}} {2}\\u = \frac {24\pm26} {2}$

We have two roots:

$u_ {1} = \frac {24 + 26} {2} = 25\\u_ {2} = \frac {24-26} {2} = - 1$

Returning the change:

$x ^ 2 = 25\\x = \pm \sqrt {25} = \pm5$

$x ^ 2 = -1$ Give the imaginary roots.

Answer:

Real roots $\pm5$

5 0

3 years ago

.....................

nordsb [41]

Answer:

Radius is 4.2 cm. The diameter is 8.4 cm

Step-by-step explanation:

8 0

3 years ago