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2 years ago

81 is 37.5% of what number

Mathematics

1 answer:

aksik [14]2 years ago

6 0

37.5% of n is 81
0.375n=81
n=216

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Please help! Ill mark brainliest if correct! help ASAP

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Answer:

Its 1,020

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Step-by-step explanation:

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2 years ago

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What is 1/3 •1/3 in exponential notation

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Answer:

Step-by-step explanation:

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2 years ago

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My name is Ann [436]

$x = 2 \\ y = 7$

is the answer to:

$y = 11 - 2x \\ 4x - 3y = - 13$

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$x = 5 \\ y = 2$

is the answer to:

$2x + y = 12 \\ x = 9 - 2y$

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$2x + y = 11 \\ x - 2y = - 7$

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is the answer to:

$x + 3y = 16 \\ 2x - y = 11$

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3 years ago

The equation of a parabola is y=x^2-10x+27. Write the equation in vertex form

azamat

Answer:

$\large \boxed{y = (x - 5)^{2} + 2 }$

Step-by-step explanation:

y = x² - 10x + 27

y = ax² + bx + c

This is the general form of the equation for a parabola.

We must convert it to the vertex form

y = (x - h)² + k, where (h,k) are the coordinates of the vertex.

We can do this by completing the square.

$\begin{array}{rcll}y & = & x^{2} - 10x + 27 & \\y - 27 & = & x^{2} - 10x & \text{Subtracted 27 from each side}\\y - 27&= & x^{2} - 10x + 25 - 25 & \text{Added and subtracted (b/2)}^{2}\\y - 27&= & (x - 5)^{2} - 25 & \text{Wrote the first three terms as the square of a binomial}\\y& = & \mathbf{(x - 5)^{2} + 2} & \text{Added 27 to each side}\\\end{array}\\\text{The vertex form of the parabola is $\large \boxed{\mathbf{y = (x - 5)^{2} + 2 }}$}$ The figure below shows that your parabola has its vertex at (5,2).

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3 years ago