B false. equilateral triangles are 60° & cannot have obtuse angles.
Food bill = $68.26
Tax rate = 7 %
Tax that will be payed = 7/100 × 68.26
= $4.78
Hope u get the answer
Answer:
1/5x=3/4hour
so since 5 times 1/5=1 then
find x
multiply both sides by 5
x=15/4 hour=3 and 3/4 hour=3 hour and 45 mins ← <u>Answer </u>
* <em>Hopefully this helps:) Mark me the brainliest:)!!</em>
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Answer:
Therefore,
x = -13 , y = 17 or x = 12 , y = 42
Step-by-step explanation:
First, you have to form equation in terms of x and y. With the given informations, the equations will be :
![x - y = - 30](https://tex.z-dn.net/?f=x%20-%20y%20%3D%20%20-%2030%20)
![{x}^{2} + (y + 3) = 189](https://tex.z-dn.net/?f=%20%7Bx%7D%5E%7B2%7D%20%20%2B%20%28y%20%2B%203%29%20%3D%20189)
Next, you have to solve it by substitution :
![x = - 30 + y - - - (1)](https://tex.z-dn.net/?f=x%20%3D%20%20-%2030%20%2B%20y%20-%20%20-%20%20-%20%281%29)
![{x }^{2} + (y + 3) = 189 - - - (2)](https://tex.z-dn.net/?f=%20%7Bx%20%7D%5E%7B2%7D%20%20%2B%20%28y%20%2B%203%29%20%3D%20189%20-%20%20-%20%20-%20%282%29)
![(1)→(2)](https://tex.z-dn.net/?f=%281%29%E2%86%92%282%29)
![{( - 30 + y)}^{2} + (y + 3) = 189](https://tex.z-dn.net/?f=%20%7B%28%20-%2030%20%2B%20y%29%7D%5E%7B2%7D%20%20%2B%20%28y%20%2B%203%29%20%3D%20189)
![900 - 60y + {y}^{2} + y + 3 = 189](https://tex.z-dn.net/?f=900%20%20-%2060y%20%2B%20%20%7By%7D%5E%7B2%7D%20%20%2B%20y%20%2B%203%20%3D%20189)
![{y}^{2} - 59y + 714 = 0](https://tex.z-dn.net/?f=%20%7By%7D%5E%7B2%7D%20%20%20-%2059y%20%2B%20714%20%3D%200)
![(y - 42)(y - 17) = 0](https://tex.z-dn.net/?f=%28y%20-%2042%29%28y%20-%2017%29%20%3D%200)
![y = 17 \: \: or \: \: 42](https://tex.z-dn.net/?f=y%20%3D%2017%20%5C%3A%20%20%5C%3A%20or%20%5C%3A%20%20%5C%3A%2042)
![sub \: \: y = 17 \: \: into \: \: (1)](https://tex.z-dn.net/?f=sub%20%5C%3A%20%20%5C%3A%20y%20%3D%2017%20%20%5C%3A%20%5C%3A%20into%20%20%5C%3A%20%5C%3A%20%281%29)
![x = - 30 + 17 = - 13](https://tex.z-dn.net/?f=x%20%3D%20%20-%2030%20%2B%2017%20%3D%20%20-%2013)
![sub \: \: y = 42 \: into \: \: (1)](https://tex.z-dn.net/?f=sub%20%20%5C%3A%20%5C%3A%20y%20%3D%2042%20%5C%3A%20into%20%5C%3A%20%20%5C%3A%20%281%29)
![x = - 30 + 42 = 12](https://tex.z-dn.net/?f=x%20%3D%20%20-%2030%20%2B%2042%20%3D%2012)