Answer:
Option (1)
Step-by-step explanation:
Fastest time recorded = 50 yards dash is 5.2 seconds.
To convert this time into the rate of miles per hour, expression to be used will be,

By cancelling common term in the numerator and denominator in the given expression we will get the answer in miles per hour.
Therefore, Option (1) will be the correct option.
Explanation:
Formula to calculate pH of a chemical or solution is as follows.
pH = ![-log [H^{+}]](https://tex.z-dn.net/?f=-log%20%5BH%5E%7B%2B%7D%5D)
Therefore, calculate the pH of given chemicals as follows.
1). Oven cleaner
pH = ![-log [H^{+}]](https://tex.z-dn.net/?f=-log%20%5BH%5E%7B%2B%7D%5D)
= ![-log [10^{-13}]](https://tex.z-dn.net/?f=-log%20%5B10%5E%7B-13%7D%5D)
= 13
2). Water
pH = ![-log [H^{+}]](https://tex.z-dn.net/?f=-log%20%5BH%5E%7B%2B%7D%5D)
=
= 6.15
3). Blood
pH =
= ![-log [4 \times 10^{-8}]](https://tex.z-dn.net/?f=-log%20%5B4%20%5Ctimes%2010%5E%7B-8%7D%5D)
= 7.40
4). Vinegar
pH =
= ![-log [63 \times 10^{-4}]](https://tex.z-dn.net/?f=-log%20%5B63%20%5Ctimes%2010%5E%7B-4%7D%5D)
= 2.20
Answer:
Last one, triangles AOB and COD
Step-by-step explanation:
In step 3, they are talking about the side/angle/side postulate. That helps in describing a triangle, therefore she must be talking about a triangle
Answer:
The answer is C. As you move closer to the center of the whirlpool, the speed of the current approaches infinity.
This means the closer you get, the faster you go, and the further the distance is the slower the speed. Hope this helps!
(Btw I got this right on the test)
Answer:903.55
Step-by-step explanation: