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kondor19780726 [428]
3 years ago
8

In standard form when do we put a negative power and a positive one

Mathematics
1 answer:
DiKsa [7]3 years ago
6 0

Answer:

Step-by-step explanation:

for negative power,you put it when you're counting backwards

for example,

writing standard form of 0.000 0012 will be

1.2 x 10^-6 (1.2 into ten to the power minus 6)

the decimal is going backwards in order to get 1.2 and it has skipped 6 digits/numbers in between.

for positive power,it is when you go forward

for example,

writing standard form of 8000 will be

8 x 10^3 (eight into ten to the power 3)

there is no decimal in 8000,so we move the decimal from  the very last 0(zero)

I'm not sure if helped you

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How many solutions are there to this equation 3x(x-4)+5-x=2x-7
stich3 [128]

Answer:

  2 solutions

Step-by-step explanation:

I like to use a graphing calculator to find solutions for equations like these. The two solutions are ...

  • x = 1
  • x = 4

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To solve this algebraically, it is convenient to subtract 2x-7 from both sides of the equation:

  3x(x -4) +5 -x -(2x -7) = 0

  3x^2 -12x +5 -x -2x +7 = 0 . . . . . eliminate parentheses

  3x^2 -15x +12 = 0 . . . . . . . . . . . . collect terms

  3(x -1)(x -4) = 0 . . . . . . . . . . . . . . . factor

The values of x that make these factors zero are x=1 and x=4. These are the solutions to the equation. There are two solutions.

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<em>Alternate method</em>

Once you get to the quadratic form, you can find the number of solutions without actually finding the solutions. The discriminant is ...

  d = b^2 -4ac . . . . where a, b, c are the coefficients in the form ax^2+bx+c

  d = (-15)^2 -4(3)(12) = 225 -144 = 81

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3 years ago
If x=3 then solve the equation: y=10x×10x-7×-12
NNADVOKAT [17]
The answer is y = 545. 
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3 years ago
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Write an equation describing the relationship of the given variables. y varies inversely as the cube root of x and when x=125, y
notka56 [123]

Answer:

y = 40 / x^1/3

Step-by-step explanation:

Given that :

y α x^1/3

y = k * 1 / x^1/3

y = k / x^1/3

When x = 125 ; y = 8

8 = k / 125^1/3

Cube root of 125 = 5

8 = k / 5

8 * 5 = k ; k = 40

Hence, expression becomes :

y = 40 / x^1/3

4 0
3 years ago
The price has changed from 125$ to 75$. By how much percent did it change
Firlakuza [10]

Answer:

-40 %

Step-by-step explanation:

((y2 - y1) / y1)*100 = your percentage change

(where y1=start value and y2=end value)

((75 - 125) / 125) * 100 = -40 %

The percentage change from 125 to 75 is -40 %

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3 years ago
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