60 divided by 4 is 15. so 2*15= 30 // 6*15= 90 // 8*15=120
Answer:
The answer is D
Step-by-step explanation:
When solving you get 23/5 this is 4.6 It says that X must be less than or equal to this
15.6 - 11.7 = 3.9
3.9 ÷ 15.6 = .25
25% of change
Answer:
3/10
Step-by-step explanation:
To find the fraction of guests that ordered chicken, we must evaluate:
1 - 2/5 - 3/10
= 1 - 4/10 - 3/10
= 1 - 7/10
= 3/10
Answer:
6 seconds
Step-by-step explanation:
Temperature of air = ![68^{\circ}\text{F}](https://tex.z-dn.net/?f=68%5E%7B%5Ccirc%7D%5Ctext%7BF%7D)
Converting to Celsius
![T=(68-32)\dfrac{5}{9}=20^{\circ}\text{C}](https://tex.z-dn.net/?f=T%3D%2868-32%29%5Cdfrac%7B5%7D%7B9%7D%3D20%5E%7B%5Ccirc%7D%5Ctext%7BC%7D)
Speed of sound in air is given by
![v=331.3\sqrt{1+\dfrac{T}{273.15}}\\\Rightarrow v=331.3\sqrt{1+\dfrac{20}{273.15}}\\\Rightarrow v=343.21\ \text{m/s}](https://tex.z-dn.net/?f=v%3D331.3%5Csqrt%7B1%2B%5Cdfrac%7BT%7D%7B273.15%7D%7D%5C%5C%5CRightarrow%20v%3D331.3%5Csqrt%7B1%2B%5Cdfrac%7B20%7D%7B273.15%7D%7D%5C%5C%5CRightarrow%20v%3D343.21%5C%20%5Ctext%7Bm%2Fs%7D)
d = Distance to travel = 2058 m
Time is given by
![t=\dfrac{d}{v}\\\Rightarrow t=\dfrac{2058}{343.21}\\\Rightarrow T=5.99\approx 6\ \text{s}](https://tex.z-dn.net/?f=t%3D%5Cdfrac%7Bd%7D%7Bv%7D%5C%5C%5CRightarrow%20t%3D%5Cdfrac%7B2058%7D%7B343.21%7D%5C%5C%5CRightarrow%20T%3D5.99%5Capprox%206%5C%20%5Ctext%7Bs%7D)
Time taken to travel 2058 m is 6 seconds.