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bazaltina [42]
4 years ago
12

What is 0.0039 written in scientific notation?

Mathematics
1 answer:
Mademuasel [1]4 years ago
5 0
3.9 * 10^-3. The way you do it is to make the number less than 10 but more than 0, then make it a product of a power of 10, ie: 120 = 1.2 * 10^2. And for numbers less than zero, the power is negative, ie: 0.03 = 3 ^ 10*-2
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3 years ago
I need help with number 3 please and thank you
murzikaleks [220]
So here we're dealing with equivalent fractions.
It's really simple to find the answer, so I'll try to explain the best I can.

2 dogs / 5 cats is really just 2/5.
If we want to find an equivalent fraction, we have to multiply the numerator and the denominator by the same number.

Currently the number of cats is 5, and we need it to be 140. What we need to do is find the number it has to be multiplied by to equal 140, which is 140 divided by 5. 140 divided by 5 is 28, so 5 x 28 = 140!

We need to multiply the denominator (5) by 28, so that we can get 140. What we have now is ?/140.

Like I said, to find an equivalent fraction, we need to multiply the numerator by the same number as we did the denominator, which is 28!

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So 2/5 is the same as 56/140.

The answer is D) 56 Dogs/140 Cats.

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