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maksim [4K]
3 years ago
15

Another problem I need assistance on ​

Mathematics
1 answer:
pantera1 [17]3 years ago
5 0

1. C

2. e

3.a

4.

5.b

6.f

7.e

8.a

sorry, i don't know #4.

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Need help on this Please answer ASAP
Vedmedyk [2.9K]

Domain:\ x\neq0\\\\\dfrac{1}{x}+\dfrac{1}{3x^2}=\dfrac{1}{3x}\\\\\dfrac{1\cdot3x}{x\cdot3x}+\dfrac{1}{3x^2}=\dfrac{1}{3x}\\\\\dfrac{3x}{3x^2}+\dfrac{1}{3x^2}=\dfrac{1}{3x}\\\\\dfrac{3x+1}{3x^2}=\dfrac{1}{3x}\qquad\text{cross multiply}\\\\(3x)(3x+1)=(3x^2)(1)\qquad\text{use distributive property}\\\\(3x)(3x)+(3x)(1)=3x^2\\\\9x^2+3x=3x^2\qquad\text{subtract}\ 3x^2\ \text{from both sides}\\\\6x^2+3x=0\\\\3x(2x+1)=0\iff3x=0\ \vee\ 2x+1=0\\\\3x=0\qquad\text{divide both sides by 3}\\x=0\notin Domain

2x+1=0\qquad\text{subtract 1 from both sides}\\\\2x=-1\qquad\text{divide both sides by 2}\\\\\boxed{x=-\dfrac{1}{2}}\to\boxed{A)}

8 0
3 years ago
Explain how to write and evaluate an algebraic expression. one more than the product of a number and seven, decreased by five; e
Cloud [144]
1) When it says more than, then you have to switch it so it will be 7n + 1 instead of 1+7n.
2) Because you then have to subtract by 5 you have to put the 7n + 1 in parentheses so it reads (7n + 1) - 5
3) And then to evaluate you just have to substitute n for 6
4) 7 * 6 = 42; 42+1 = 43; 43-5 = 38
5) The answer to this expression would be 38

Hope it helps :)

Please give brainliest
7 0
3 years ago
Read 2 more answers
8. Find the value of k, if (1-1) is a solution of the equation 3x-ky =8. Also, find the coordinates of
Yakvenalex [24]

Answer:

k = 5 and (6,2).

Step-by-step explanation:

Since (1,-1) is a solution of the equation 3x - ky = 8, so the point (1,-1) will satisfy the equation above.

Hence, putting x = 1 and y = -1 in the equation will give left-hand side = right-hand side.

So, 3(1) - k(-1) = 8

⇒ 3 + k = 8

⇒ k = 5 (Answer)

Therefore, the equation of the straight line is 3x - 5y = 8 ....... (1)

Now, putting x = 6 , then from equation (1) we get y = 2

Therefore, (6,2) is also a point on the graph of equation (1). (Answer)

8 0
4 years ago
How does tan^-1(17/2)=83.3?
MA_775_DIABLO [31]

Put your calculator in <em>degrees mode</em>.

1.45 is the correct number of <em>radians</em>.

6 0
3 years ago
Is the expression 3(x+2) equivalent to 3x+6
Delvig [45]
Yes...

<span> 3(x+2)...using distributive property...

= 3x + 6</span>
6 0
3 years ago
Read 2 more answers
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