the temp of the sun is about 1.5 x 10^7 degrees celsius what is the temp written in decimal notation

The temperature of the sun, 1.5 x 10^7 degrees Celsius, in decimal notation is 15,000,000 degrees Celsius.

use scientific notation to determine which of these numbers has the least value 86,659,000; 867,450,000; or 86,423,000. write your answer in scientific notation, expressed to the exact decimal place

To determine which of the numbers has the least value, we can express all of them in scientific notation.

86,659,000 = 8.6659 x 10^7
867,450,000 = 8.6745 x 10^8
86,423,000 = 8.6423 x 10^7

By comparing the exponents in their scientific notations, we see that 8.6659 x 10^7 has the least value.

place the numbers in descending order.

4.3x10^-5 ; 6.4x10^-6 ; 4.3x10^-6 ; 6.4x10^-4

To place the numbers in descending order, we need to compare the coefficients first and then the exponents if the coefficients are equal.

Starting with the coefficients:
6.4 x 10^-6
4.3 x 10^-6
Next, comparing the exponents:
6.4 x 10^-6
4.3 x 10^-6
Lastly,
6.4 x 10^-4

Therefore, the numbers in descending order are:
6.4 x 10^-4
6.4 x 10^-6
4.3 x 10^-6
4.3 x 10^-5

The temperature of the sun, approximately 1.5 x 10^7 degrees Celsius, can be written in decimal notation as 15,000,000 degrees Celsius.

To convert 1.5 x 10^7 degrees Celsius to decimal notation, you can simply move the decimal point seven places to the right since the exponent of 10 is positive.

Starting with 1.5, we move the decimal point seven places to the right, resulting in 15,000,000.

So, the temperature of the sun is approximately 15,000,000 degrees Celsius in decimal notation.