what is 0.000750 in scientific notation?
a.75 x 10^-4
b. 7.5 x 10^-3
c.7.5 x 10^-4
d. 7.5 x 10^-5
what is 27/6 written as a decimal?
a 4.2
b 4.3
c 4.4
d 4.5
what is 8.57 x 10^-4 in standard form?
a.85000
b. 0.00857
c. 8570000
d. 0.000857
which of the following is an example of an irrational number?
a. sqaure root of 25
b. -31
c. 1.414213562
d. 1/15
which number is equivalent to 0.45(repeating decimsl)
a. 1/45
b. 5/11
c. 4/5
d. 1/4
Someone can check your answers.
Please post them.
b.
b.
a.
c.
b
but i dont think they are right:(
I'm not sure about question 1 but, 2 isn't B it is D.
You start by simplifying the fraction then dividing the numerator by denominator. ( 27/6 = 9/2. 9 / 2 = 4.5 )
Question 3 is 0.0008570000000000001 which is answer B not A. Question 4; as far as I know, is correct. A rational number is a number that can be written as a fraction. Rational numbers include terminating and repeating decimals. For example, Pi is not a rational number because it neither repeats and it's not terminating. Pi can't be a fraction. Last question, You also have right.
You gave it a good shot! Try adding in a little more practice before jumping into your next quiz or text. <3
The answer to the first question is c
You welcome
To convert 0.000750 to scientific notation, we need to move the decimal point to the right until there is only one non-zero digit to its left. Count the number of places you move the decimal point to the right, and that will be the exponent of 10.
In this case, we need to move the decimal point 4 places to the right. Therefore, the scientific notation for 0.000750 is 7.5 x 10^-4.
So the answer is (c) 7.5 x 10^-4.
To convert 27/6 to a decimal, divide 27 by 6 using long division.
4.5
________
6 | 27
- 24
------
3
Therefore, the decimal equivalent of 27/6 is 4.5.
So the answer is (d) 4.5.
To convert 8.57 x 10^-4 to standard form, we need to move the decimal point to the left until only one non-zero digit remains to the left of the decimal point. Count the number of places you move the decimal point to the left and that will be the exponent of 10.
In this case, we need to move the decimal point 4 places to the left. Therefore, the standard form of 8.57 x 10^-4 is 0.000857.
So the answer is (d) 0.000857.
An irrational number is a number that cannot be written as a fraction of two integers and has non-repeating and non-terminating decimal representation.
The square root of 25 is a rational number because it can be simplified to the whole number 5 which is a fraction (5/1).
-31 is a rational number because it can be written as -31/1 or -62/2.
1/15 is a rational number because it can be written as a fraction.
Therefore, the only option that is an example of an irrational number is (c) 1.414213562, which is an approximation of the square root of 2.
So the answer is (c) 1.414213562.
To express 0.45 as a repeating decimal, we use the notation for repeating decimals, which is to put a line or a bar over the repeating part.
To find out the repeating part, we can multiply 0.45 by 100 to remove the decimal:
0.45 * 100 = 45
So the repeating part is 45.
To express this as a fraction, we put 45 over 99 (since there are two decimal places, which is represented by two nines).
45/99 is already in simplest form. But we notice that both the numerator and the denominator are divisible by 9.
Dividing both the numerator and denominator by 9 gives us 5/11.
Therefore, the number equivalent to 0.45 (repeating decimal) is 5/11.
So the answer is (b) 5/11.
1. b. - I don't know
2. b. - no
3. a - I don't know
4. c. - yes
5. b - yes