.Did I do the following four problems right?
1. (5 x 104) – (3 x 103)
(50 x 103) – (3 x 103)
50 – 3 =47
47 x 103
47/10= 4.7
4.7 x 102
Incorrect ...That should be 4.7 * 1042. (1.25 x 103) + (4.25 x 102)
(12.5 x 102) + (4.25 x 102)
12.5 +4.25
16.75 x 102
16.75/10 = 1.675
1.675 x 101
Incorrect ...That should be 1.675 * 103
3. (4.3 x 105) + (2.1 x 102)
(4300 x 102) + (2.1 x 102) .... Then
= 4302.1 * 102
= 4.3021 * 105
430 x 102 =43,000
4.1 x 105 = 430,000
(43,000) + (430,000)
473,000
473,000/100,000 =4.73
4.73 x 105
Incorrect ...That should be 4.3021 * 105
4. 630,000 = 630,000/100,000=0.63
630,000 = 6.3 x 105..................Correct
\(\displaystyle \ \ \)anber and Subhotosh Khan, there was the first of the errors beginning with the second line above (as pointed out by me in bold black text).combined posts of anber and Subhotosh Khan said:3. (4.3 x 105) + (2.1 x 102)
(430 x 102) + (2.1 x 102) .... Then <----- Incorrect. It should be \(\displaystyle \ \ (4300 \ \times \ 10^2) \ + \ (2.1 \ \times \ 10^2).\)
= 432.1 * 102 <----- Incorrect. It should be \(\displaystyle \ \ 4302.1 \ \times \ 10^2. \)
= 4.321 * 104 <----- Incorrect. It should be \(\displaystyle \ \ 4.3021 \ \times \ 10^5.\)
430 x 102 =43,000
4.1 x 105 = 430,000
(43,000) + (430,000)
473,000
473,000/100,000 =4.73
4.73 x 105
Incorrect ...That should be 4.321 * 104 <----- Incorrect. It should be \(\displaystyle \ \ 4.3021 \ \times \ 10^5.\)
\(\displaystyle \ \ \)anber and Subhotosh Khan, there was the first of the errors beginning with the second line above (as pointed out by me in bold black text).