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Viefleur [7K]
3 years ago
6

Let f be the function given by f(x) = 2x +3x^2 Evaluate (1/3)​

Mathematics
1 answer:
Rus_ich [418]3 years ago
3 0

Answer:

A) 1

Step-by-step explanation:

To evaluate f(1/3) = 2x + 3x ^2, plug in 1/3 for x.

f(1/3) = 2*(1/3) + 3*((1/3)^2)

Then evaluate

2(*1/3) = 2/3

(1/3)^2 = 1/9 * 3 = 1/3

1/3 + 2/3 = 1

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I need help on number 16 these instructions say to solve these equations by cross multiplying
Grace [21]

Answer:

  15.  x = 4

  16.  a = 19

Step-by-step explanation:

"Cross multiply" essentially means "multiply both sides of the equation by the product of the denominators."

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<h3>15.</h3>

  \dfrac{x}{6}=\dfrac{2}{3}\\\\3(x)=6(2)\qquad\text{"cross multiply"}\\\\\boxed{x=4}\qquad\text{divide by 3}

This is an example of a problem in which cross-multiplying introduces the need for an extra step: divide by 3. Had we simply multiplied by the denominator of the x-term, we would have been finished in one step:

  x = 6(2/3) = 4

That is, rather than multiplying by the <em>product of the denominators</em>, sometimes the problem can be solved more easily if you multiply by their <em>least common multiple</em>.

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<h3>16.</h3>

  \dfrac{a+1}{a+5}=\dfrac{a-4}{a-1}\\\\(a-1)(a+1)=(a+5)(a-4)\qquad\text{"cross multiply"}\\\\a^2-1=a^2+a-20\qquad\text{simplify}\\\\\boxed{19=a}\qquad\text{add $20-a^2$}

8 0
3 years ago
Solve inequality <br> 58 - 10xs 20 + 9x.
lions [1.4K]

Answer:

x>=2 so B

Hope this helps :)

4 0
2 years ago
Can someone help me with these problems and show work please !!
Flauer [41]

Answer:

I have just wrote answers

7 0
2 years ago
Bridget was thinking of a number. Bridget adds 8 to it, then doubles it and gets an answer of 21.9. What was the original number
likoan [24]

Answer:

2.95

Step-by-step explanation:

All you have to do is the reverse operations. Divide 21.9 by 2 then subtract it by 8.

8 0
3 years ago
2.3x+1.2+2.5x=9.2-4.3x
madreJ [45]
First lets subract 1.2 from each side to get
2.3x+2.5x=8-4.3x
Then Combine like terms to get
4.8x+8-4.3x
Then add 4.3 to each side
9.1x=8
x equals about 0.88
7 0
3 years ago
Read 2 more answers
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