For what value of a will 8×103 be 40 times larger than a×102 ?(1 point) $$

its wrong

Use scientific notation to determine which of these numbers has the least value: 98,789,000; 987,890,000; or 89,987,000. Write your answer in scientific notation, expressed to the exact decimal place.(1 point)

To determine which number has the least value, we need to convert each number to scientific notation.

98,789,000 can be written as 9.8789 x 10^7.
987,890,000 can be written as 9.8789 x 10^8.
89,987,000 can be written as 8.9987 x 10^7.

Comparing the exponents, we see that 9.8789 x 10^7 has the smallest exponent, making it the least value among the given numbers.

answer

Apologies for the confusion. The correct answer is:

The number with the least value, expressed in scientific notation, is 8.9987 x 10^7.

Place the numbers in descending order. 2.3 × 10−10 ; 3.2 × 10−10 ; 2.3 × 10−12 ; 2.3 × 10−8 (2 points)

To place the numbers in descending order, we need to compare the exponents first.

2.3 × 10^(-12) has the smallest exponent, so it will be the first number:

2.3 × 10^(-12)

Next, we compare the remaining three numbers:

2.3 × 10^(-10)
2.3 × 10^(-8)
3.2 × 10^(-10)

Among these three numbers, 2.3 × 10^(-8) has the largest exponent, so it will be the second number:

2.3 × 10^(-12)
2.3 × 10^(-8)

Finally, we compare the remaining two numbers:

2.3 × 10^(-10)
3.2 × 10^(-10)

3.2 × 10^(-10) has a larger coefficient than 2.3 × 10^(-10), so it will be the third number:

2.3 × 10^(-12)
2.3 × 10^(-8)
3.2 × 10^(-10)

Therefore, the numbers in descending order are:
2.3 × 10^(-12), 2.3 × 10^(-8), and 3.2 × 10^(-10).

its wrong

Apologies for the mistake. Let's reorder the numbers correctly:

2.3 × 10^(-12)
2.3 × 10^(-10)
3.2 × 10^(-10)
2.3 × 10^(-8)

Therefore, the correct order from largest to smallest is:
2.3 × 10^(-8)
3.2 × 10^(-10)
2.3 × 10^(-10)
2.3 × 10^(-12)

whats answer