Which does not show a direct variation between x and y?  A.y = x/9  B.y = 2x  C.y = 0.5x  D.y = 9/x

If f(x) varies directly with x, and f(x) = 8 when x = 6, write the direct linear variation equation.
 
 A.
 f(x) = 3/4x
  B.f(x) = 6x  C.f(x) = 8x  D.f(x) = 4/3x

Find the constant of variation for the relationship f(x)= 30x.
  A.10  B.30  C.x  D.f(x)


If f(x) varies directly with x, and f(x) = 56 when x = 8, find the value of f(x) when x = 2  A.4  B.7  C.8  D.14

Answers

Answer 1
Answer: (1)\ndirect\ variation\ between\ x\ and\ y:\ \ \ y=k\cdot x\ \ \ and\ \ \ k\in\ R\n\nAns.\ NOT\ direct\ is\ D\n\n(2)\nf(x) = m\cdot x\ \ \ and\ \ \ f(6)=8\n\n \Rightarrow\ \ \ m\cdot 6=8\ \ \ \Rightarrow\ \ \ m= (8)/(6) = (4)/(3) \ \ \ \ \Rightarrow\ \ \ \ Ans.\ D\n\n(3)\nf(x)=30x\ \ \ \Leftrightarrow\ \ \ (f(x))/(x) =30\ \ \ \ \ \ \Rightarrow\ \ \ \ constans=30\ \ \ \ Ans.\ B.

\n\n(4)\nf(x)=m\cdot x\ \ and\ \ f(8)=56\n\nm\cdot8=56\ \ \Leftrightarrow\ \ m= (56)/(8) =7\ \ \Rightarrow\ \ \ f(x)=7x\ \ \ \Rightarrow\ \ \ f(2)=7\cdot2=14\n\nAns.\ D.

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Round 992,449 to the nearest hundred thousand

Answers

1,000,000 because the number behind the 900,000 is 90,000 which makes that one greater

What is 3.25 repeating as a fraction

Answers

I assume you mean 3.25 repeating as in the .25 repeating, not just the 5 or something like that. Anyways, here's the solution:
Let x = 3.25 repeating
100x = 325.25 repeating on the 0.25 (you can do this by just moving the decimal place back 2 times, and since repeating decimals go on forever, it's like you just added another "2" and "5" to the front right behind the 3. But it is still mathematically correct. Anyways, we subtract 1x from both sides, but on the right side of the equation, we actually substitute the value of x in, so it would be 
100x-x on the left, and
325.25 repeating - 3.25 repeating on the right side.
On the left, 100x becomes 
99x
and on the right side, the repeating decimals cancel out to give you
322 (subtracting the 3 still)
so we currently have
99x=322
divide both sides by 99 to get
x = 322/99
which cannot be simplified, so the final fraction is
(322)/(99)
or
3 (25)/(99)

In the expression 18 is 20% of 90, 18 is the

Answers

the answer to your question is 18, how 20\100x90=18

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Answers

LA=sides (not bases)
LA=2H(L+W)
H=4
L=11
W=7

LA=2*4*(11+7)
LA=8*18
LA=144

answer is 144 cm^2

Work out the circumference of a circle with diameter 1.8 cm.Take it to be 3.142 and give your answer to 1 decimal place.

Answers

Answer: 5.7

Step-by-step explanation:

Multiply the diameter by pi 3.14

-7(1+3p)<=98
<= means greater then or egual to ok

Answers

Means less than or equal.

And the solution is p≤ -5