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3 years ago

15

If 3.485 ÷ 5.1 is written in long division form as so that the divisor is written as a whole number, where should the decimal po

int be placed in the dividend

1 answer:

sineoko [7]3 years ago

8 0

It is 3.485 in the inside and 5.1 at the outside but the answer is <span>0.68333333333</span>

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2 years ago

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3 years ago

Prove that if r is any rational number, then 3r2 − 2r + 4 is rational. The following properties may be used in your proof. Prope

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Given:

Expression is

$3r^2-2r+4$

To prove:

If r is any rational number, then $3r^2-2r+4$ is rational.

Step-by-step explanation:

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Property 2: The sum of any two rational numbers is rational. It is Theorem 4.3.2.

Property 3: The product of any two rational numbers is rational. It is Exercise 15 in Section 4.3.

Let r be any rational number.

We have,

$3r^2-2r+4$

It can be written as

$3(r\times r)-2r+4$

Now,

3, -2 and 4 are rational numbers by property 1.

$r^2=r\times r$ is rational by Property 3.

$3r^2\text{ and }-2r$ are rational by Property 3.

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So, $3r^2-2r+4$ is rational.

Hence proved.

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3 years ago