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3 years ago

What is the scientific notation of 42

Mathematics

2 answers:

RideAnS [48]3 years ago

8 0

Answer:

Step-by-step explanation: To write 49 in scientific notation, first write a decimal point in the number so that there is only one digit to the left of the decimal point.

So here we have 4.2. Next, count the number of places that we would need to move the decimal point in 4.2 to get back to the original number which is 42.

Since we would need to move the decimal point 1 place to the right to get back to the original number, we would need to multiply 4.2 by 10 to the 1st power. The exponent is positive because we need to move the decimal point to the right.

Therefore, 42 can be written in scientific notation as 4.2 × $10^{1}.$

Aleksandr-060686 [28]3 years ago

7 0

The answer is 7, because you multiply it by 6.

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Margarita [4]

Set up a proportion:

$\frac{8}{270} = \frac{x}{72.5}$

The numerator represents fluid ounces of milk, and the denominator represents milligrams of calcium.

Simplify the first fraction to make multiplication easier:

$\frac{8}{270} \div \frac{2}{2} = \frac{4}{135}$
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Cross multiply the fractions:

$72.5 * 4 = 290$
$135x = 290$

Divide both sides by 135 to get x by itself:

$290 \div 135 = 2.1$
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