Answer:
1.36mph
Step-by-step explanation:
The escalator is moving at 2ft/s, lets convert this to miles/second.
2ft/s = 0.000378788miles/s.
Now that we have the miles/second lets multiply this value by 3600 to get the miles/h, because there are 3600 seconds in an hour.
2ft/s=1.3636368miles/h
Or approximately 1.36miles/h.
Since we can't use a zero at the start and end, then we have 810 different ways.
If we can't have a leading digit of zero, then we still have 9 available digits to choose from (9P1)
Now, the second term can be of any number, so we will have 10 different digits to choose 1 (10P1)
Now, the final term cannot be a zero, so we will have 9 available digits to choose from (9P1)
Hence, our final number of ways is: 9 × 10 × 9 = 810 ways.
Answer:
<h2>C. (-1, 9)</h2>
Step-by-step explanation:
![\left\{\begin{array}{ccc}y=-3x+6\\y=9\end{array}\right\ \text{put the value of}\ y\ \text{to the first equation}\\\\9=-3x+6\qquad\text{subtract 6 from both sides}\\3=-3x\qquad\text{divide both sides by (-3)}\\-1=x\to x=-1](https://tex.z-dn.net/?f=%5Cleft%5C%7B%5Cbegin%7Barray%7D%7Bccc%7Dy%3D-3x%2B6%5C%5Cy%3D9%5Cend%7Barray%7D%5Cright%5C%20%5Ctext%7Bput%20the%20value%20of%7D%5C%20y%5C%20%5Ctext%7Bto%20the%20first%20equation%7D%5C%5C%5C%5C9%3D-3x%2B6%5Cqquad%5Ctext%7Bsubtract%206%20from%20both%20sides%7D%5C%5C3%3D-3x%5Cqquad%5Ctext%7Bdivide%20both%20sides%20by%20%28-3%29%7D%5C%5C-1%3Dx%5Cto%20x%3D-1)
He is right because if you find the unit rate and multiply it by the miles per hour you get the 150 miles per hour.
Answer:
x+3=7
Step-by-step explanation:
7-3=4
x=4
hope it helps :)