Answer:
t = 68000 s
Step-by-step explanation:
Given that,
The average time Sally spent for training for her weight lifting competition in the month of May is
.
We need to write this time in standard notation.
The power of 10 is 4. 10⁴ can be written as 10000.
![6.8\times 10^4=\dfrac{68}{10}\times 10000\\\\=68000](https://tex.z-dn.net/?f=6.8%5Ctimes%2010%5E4%3D%5Cdfrac%7B68%7D%7B10%7D%5Ctimes%2010000%5C%5C%5C%5C%3D68000)
So, the standard time is equal to 68000 s.
Answer:
-3² is 9
Step-by-step explanation:
We can write -3² as -3 × -3 and the product of both 3 is 9 and the sign '-' minus changes into '+' plus sign due to the laws of sign i.e. '-' × '-' = '+'.
I hope this will help you.
Answer:
31.5 more hours
Step-by-step explanation:
20/7 = 110/x
20x = 770
x = 38.5 hours
38.5 - 7 = 31.5 more hours