Solved on Jan 16, 2024

Determine the product of 8.9×10198.9 \times 10^{19} and 1.2×1021.2 \times 10^{2} using a calculator.

STEP 1

Assumptions
1. The notation EE represents the exponent in scientific notation, where aEba E b means a×10ba \times 10^b.
2. We are using a calculator to perform the multiplication.

STEP 2

First, we need to understand the scientific notation. The expression 8.9E198.9 E 19 means 8.9×10198.9 \times 10^{19}, and 1.2E21.2 E 2 means 1.2×1021.2 \times 10^2.

STEP 3

Now, we will multiply the two numbers in scientific notation.
8.9×10191.2×1028.9 \times 10^{19} \cdot 1.2 \times 10^2

STEP 4

We can separate the multiplication into two parts: the multiplication of the decimal numbers and the multiplication of the powers of 10.
(8.91.2)×(1019102)(8.9 \cdot 1.2) \times (10^{19} \cdot 10^2)

STEP 5

First, multiply the decimal numbers using a calculator.
8.91.2=10.688.9 \cdot 1.2 = 10.68

STEP 6

Next, add the exponents when multiplying the powers of 10, according to the rule 10a10b=10a+b10^a \cdot 10^b = 10^{a+b}.
1019102=1019+2=102110^{19} \cdot 10^2 = 10^{19+2} = 10^{21}

STEP 7

Combine the results of the decimal multiplication and the powers of 10 multiplication.
10.68×102110.68 \times 10^{21}

STEP 8

The result in scientific notation is:
1.068×101×10211.068 \times 10^1 \times 10^{21}

STEP 9

Now, add the exponents of the powers of 10.
1.068×101+21=1.068×10221.068 \times 10^{1+21} = 1.068 \times 10^{22}

STEP 10

Finally, we write the result in scientific notation.
8.9E191.2E2=1.068×10228.9 E 19 \cdot 1.2 E 2 = 1.068 \times 10^{22}
The result of 8.9E191.2E28.9 E 19 \cdot 1.2 E 2 using a calculator is 1.068×10221.068 \times 10^{22}.

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