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4 years ago

Help please dont know density

Mathematics

1 answer:

Nana76 [90]4 years ago

8 0

The formula for density is:

Density is $\frac{Mass}{Volume}$

To find the answer we must create the formula:

$\frac{20 grams}{5 cm^{2}}$

Which gives us the answer:
4 grams per centimeter squared

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Calculate the momentum of a 700 g ball that is rolling down a ramp at 4.6 m/s.

enyata [817]

Momentum= mass x velocity
3220kg m/s = 700g x 4.6 m/s

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3 years ago

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Answer:

88, A

Step-by-step explanation:

16 x 4 = 64

3 x 8 = 24

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3 years ago

Problem:

Lana71 [14]

Answer:

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4 years ago

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Answer:

Step-by-step explanation:

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3 years ago

Write two expressions with unlike denominators whose sum is x-3/x+2, I need help it is confusing for me.

skad [1K]

Answer:

$\displaystyle A=\frac{x-2}{x+3}$

$\displaystyle B=\frac{-5}{(x+3)(x+2)}$

Step-by-step explanation:

We need to find two expressions with unlike denominators what sum

$\displaystyle S=\frac{x-3}{x+2}$

Let's suppose one of the expressions is:

$\displaystyle A=\frac{x-2}{x+3}$

Now we subtract S minus A to find the other expression B:

$\displaystyle B=S-A=\frac{x-3}{x+2}-\frac{x-2}{x+3}$

Multiply the first fraction by x+3 and the second by x+2;

$\displaystyle B=(x+3)\frac{x-3}{(x+3)(x+2)}-(x+2)\frac{x-2}{(x+3)(x+2)}$

Operating:

$\displaystyle B=\frac{x^2-9}{(x+3)(x+2)}-\frac{x^2-4}{(x+3)(x+2)}$

Subtracting both fractions with like denominators:

$\displaystyle B=\frac{x^2-9-(x^2-4)}{(x+3)(x+2)}$

Simplifying:

$\displaystyle B=\frac{-5}{(x+3)(x+2)}$

Thus the two expressions are:

$\displaystyle A=\frac{x-2}{x+3}$

And

$\displaystyle B=\frac{-5}{(x+3)(x+2)}$

8 0

3 years ago