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Ymorist [56]
2 years ago
15

Which of these shapes are quadrilaterals? Choose ALL the correct answers.

Mathematics
1 answer:
kherson [118]2 years ago
3 0

Answer:

The red square, the green rectangle, the pink rhombus, and the green trapezoid.

Step-by-step explanation:

A quadrilateral is a shape that has 4 sides so all you have to do is count how many sides the shape has.

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Two trains left the cities A and B at the same time and headed towards each other. The cities are s miles apart. The first train
mezya [45]

The formula of t in terms of s , v_{1} , v_{2} is

t=\frac{s}{(v_{1}+v_{2})}

The value of t  when s = 310 , v_{1} = 75 , v_{2} = 80 is 2 hours

Step-by-step explanation:

Two trains left the cities A and B at the same time and headed towards

each other

  • The cities are s miles apart
  • The first train was traveling at the speed of v_{1} mph
  • The second train was traveling at the speed of v_{1} mph
  • After t hours the two trains met each other

∵ The cities are s miles apart

∵ After t hours the two trains met each other

∴ s = s_{1} + s_{2}, where s_{1} is the

   distance that the 1st train moved in t hours and s_{2}

    is the distance that the 2nd train moved in t hours

∵ s = v t

∴ s_{1} = v_{1} t

∴ s_{2} = v_{2} t

- Substitute them in the equation of s

∴ s = v_{1} t + v_{2} t

- Take t as a common factor in the right hand side

∴ s = t ( v_{1} + v_{2} )

- Divide both sides by ( v_{1} + v_{2} )

∴ t=\frac{s}{(v_{1}+v_{2})}

The formula of t in terms of s , v_{1} , v_{2} is

t=\frac{s}{(v_{1}+v_{2})}

∵ s = 310 m/h

∵ v_{1} = 75 m/h

∵ v_{2} = 80 m/h

- Substitute these values in the formula of t above

∴ t=\frac{310}{(75+80)}=\frac{310}{155}

∴ t = 2 hours

The value of t  when s = 310 , v_{1} = 75 , v_{2} = 80 is 2 hours

Learn more:

You can learn more about distance, speed and time in brainly.com/question/1748290

#LearnwithBrainly

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