Question

Express your answer in scientific notation
8.3 x 10^9 - 2.1 x 10^7
A. 6.2 x 10^2
B. 8.279 x 10^9

Answer 1

8.3 x 10^9 - 2.1 x 10^7
express in scientific notation
A. -8.279 x 10^9
B. 6.20 x 10^2
C. 8.279 x 10^9
D. -6.20 x 10^2

Answer 2

A rectangular section of wilderness will be set aside as a new wildlife refuge. Its dimensions are 6 x 10^3 meters by 3 x 10^4 meters. Find the area of the land in square meters. Put your answer in scientific notation.

Answer 3

( 2 x 10^-3) x ( 3 x 10^7)
Multiply the expressions on the left and match them with their appropriate result

Answer 4

To subtract two numbers expressed in scientific notation, the exponents must be the same. Therefore, we need to rewrite both numbers with the same exponent.

8.3 x 10^9 - 2.1 x 10^7 can be rewritten as:

(8.3 x 10^9) - (0.21 x 10^8)

Next, we need to subtract the decimal parts:

8.3 - 0.21 = 8.09

Now, we can express the answer in scientific notation:

8.09 x 10^9

Therefore, the answer is not listed among the options given.

Answer 5

To subtract numbers in scientific notation, we need to have the same exponent. Let's rewrite the numbers in scientific notation with the same exponent:

8.3 x 10^9 - 2.1 x 10^7 can be rewritten as (8.3 x 10^9) - (0.021 x 10^9).

Now we can subtract the numbers:

8.279 x 10^9

So, the correct answer is C. 8.279 x 10^9.

Answer 6

To find the area of the rectangular section, we need to multiply its length and width.

The length is 6 x 10^3 meters, and the width is 3 x 10^4 meters.

To multiply these numbers, we can multiply the coefficients and add the exponents:

6 x 10^3 * 3 x 10^4 = (6 * 3) x (10^3 * 10^4) = 18 x 10^(3+4) = 18 x 10^7

So, the area of the land is 18 x 10^7 square meters.

Answer 7

To multiply the expressions on the left, we can multiply the coefficients and add the exponents:

(2 x 10^-3) x (3 x 10^7) = (2 x 3) x (10^-3 x 10^7) = 6 x 10^-3+7 = 6 x 10^4

So, the result of the multiplication is 6 x 10^4.

Matched result: A. 6 x 10^4