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bekas [8.4K]
3 years ago
8

Given f(x) = 5 - x?, find f(3).

Mathematics
2 answers:
d1i1m1o1n [39]3 years ago
7 0

Answer:

2

Step-by-step explanation:

if x is 2 that means 2 + 3 = 5

Give me brainllest Plz

masha68 [24]3 years ago
6 0

Answer:

the answer is 2

Step-by-step explanation:

just plug in the 3 for x and perform the neccessary calculation.

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Find the slope<br> 1) y=4x+5
OlgaM077 [116]

Answer: there's the slope!!!

Step-by-step explanation:I saw the slope

6 0
3 years ago
What is the x-intercept of the line 10x-5y=40
jasenka [17]

Answer:

4

Step-by-step explanation:

The x-intercept occurs when y=0, if you think about it graphically.  Plug y=o into your equation:

10x - 5(0) = 40

10x = 40 (divide each side by 10)

x=4

8 0
3 years ago
The line integral of (2x+9z) ds where the curve is given by the parametric equations x=t, y=t^2, z=t^3 for t between 0 and 1. Pl
Naya [18.7K]
Let r = (t,t^2,t^3)

Then r' = (1, 2t, 3t^2)

General Line integral is:
\int_a^b f(r) |r'| dt

The limits are 0 to 1
f(r) = 2x + 9z = 2t +9t^3
|r'| is magnitude of derivative vector \sqrt{(x')^2 + (y')^2 + (z')^2}

\int_0^1 (2t+9t^3) \sqrt{1+4t^2 +9t^4} dt

Fortunately, this simplifies nicely with a 'u' substitution.

Let u = 1+4t^2 +9t^4

du = 8t + 36t^3  dt

\int_0^1 \frac{2t+9t^3}{8t+36t^3} \sqrt{u}  du \\  \\ \int_0^1 \frac{2t+9t^3}{4(2t+9t^3)} \sqrt{u}  du \\  \\  \frac{1}{4} \int_0^1 \sqrt{u}  du

After integrating using power rule, replace 'u' with function for 't' and evaluate limits:
=\frac{1}{4} |_0^1 (\frac{2}{3}) (1+4t^2 +9t^4)^{3/2} \\  \\ =\frac{1}{6} (14^{3/2} - 1)
7 0
3 years ago
Enny White is shopping for CDs. She decides to purchase 3 movie soundtracks. The music store has 7 different movie soundtracks i
Gala2k [10]

Answer:

35 different selections of soundtracks are possible

Step-by-step explanation:

Total number of soundtracks available at the store = 7

Enny decides to purchase 3 movie soundtracks.

So, in this problem we have to find in how many ways can Enny chose 3 soundtracks out of 7. The order in which the soundtracks are chosen does not matter e.g soundtracks A,B and C are the same as soundtracks B,C and A.

In an arrangement when the order does not matter, we use combinations to find the total possible number of arrangements or selections.

So, for this problem choosing 3 soundtracks out of 7 means forming combinations from 7 objects taken 3 at a time. This can be represented mathematically as:

^{7}C_{3}

The general formula for combinations is:

^{n}C_{r}=\frac{n!}{r!\times(n-r)!}

Using the values, we get:

^{7}C_{3}=\frac{7!}{3!\times(7-3)!} =35

This means, Enny can make 35 different selections of soundtracks.

7 0
3 years ago
Pls help me with this?
wel

Answer:

<u>C. 3</u>

Step-by-step explanation:

A^2+B^2=C^2

A^2+4^2=5^2

A^2+16=25

A^2=9

A=3

5 0
2 years ago
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