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3 years ago

How to factor 25x^2 - 81= 0

1 answer:

4 0

Your question is a difference of squares. both terms that need to be factored are squared. to solve take the square root of each put into two terms one of addition and one of subtraction.

anwser= (5x-9)(5x+9)

the reason this works is because when you foil you get
25x²-45x+45x-81
the middle terms cancel revealing
25x²-81

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Pls just type it in no files pls and thank you

Nana76 [90]

Answer:

Step-by-step explanation:

First type of clay required 3 cups of flour per batch

She made 5 batches

5 * 3 = 15

So she used 15 cups of flour for the first type of clay

Second kind of clay required 4 cups of flour per batches

She made 4 batches

4 * 4 = 16

So she used 16 cups of flour for the second type of clay

we now add the total number of cups of flour used for each type of clay

16 + 15 = 31

She used a total of 31 cups of flour

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3 years ago

Find the proportion of observations from a standard Normal distribution that falls in each of the following regions. -2.31 <

Igoryamba

$\mathbb P(-2.31$

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3 years ago

What is the answer to this too?

Radda [10]

The answer to this is 5%

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3 years ago

Estimates of the number of cells in the human body vary over an order of magnitude. Indeed, the precise number varies from one

Amiraneli [1.4K]

Answer:

a) 2.00 × 10¹⁰; b) 2.00 × 10¹³

Step-by-step explanation:

a) No. of cells in 1 cm³

$\text{No. of cells} =\text{1 cm}^{3} \times\left( \dfrac{\text{1 m}}{\text{100 cm}}\right )^{3} \times \left (\dfrac{1 \, \mu \text{m} }{10^{-6}\,\text{ m}}\right )^{3} \times \dfrac{\text{1 cell}}{\text{50 $\,\mu$m}^{3}} = \mathbf{2.00 \times 10^{10}} \textbf{ cells}$

b) No. of cells in 1 L

$\text{No. of cells} = \text{1 L} \times \dfrac{\text{1000 cm}^{3}}{\text{1 L}} \times \dfrac{2 \times 10^{10} \text{ cells}}{\text{1 cm}^{3}} = \mathbf{2.00 \times 10^{13}} \textbf{ cells}$

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3 years ago

What is the gcf of 42 and 56<br><br><br> What is the gcf of 42 and 56

Sholpan [36]

[ Answer ]

[ Explanation ]

The GCF is the greatest number that goes into two numbers. 14 is the greatest number that goes into both 42 and 56 evenly.

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6 0

3 years ago

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