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zheka24 [161]
2 years ago
13

Five candy bars cost $4.32 or eight candy bars cost $6.48. Which is a better buy?

Mathematics
2 answers:
Semenov [28]2 years ago
7 0

Answer:

C

Step-by-step explanation:

4.32/5=0.86 per bar

6.48/8=0.81 per bar <---- better buy

Citrus2011 [14]2 years ago
6 0

Answer:

C

Step-by-step explanation:

4.32/5=0.86 per bar

6.48/8=0.81 per bar <---- better buy

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Step-by-step explanation:

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Doug hits a baseball straight towards a 15 ft high fence that is 400 ft from home plate. The ball is hit 2.5ft above the ground
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Answer:

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Step-by-step explanation:

u = Initial velocity of baseball

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x=u_xt\\\Rightarrow x=u\cos\theta t\\\Rightarrow t=\dfrac{x}{u\cos\theta}\\\Rightarrow t=\dfrac{400}{u\cos30^{\circ}}\\\Rightarrow t=\dfrac{400}{u\dfrac{\sqrt{3}}{2}}\\\Rightarrow t=\dfrac{800}{u\sqrt{3}}

Displacement in y direction

y=y_0+u_yt+\dfrac{1}{2}a_yt^2\\\Rightarrow y=y_0+u\sin\theta t+\dfrac{1}{2}a_yt^2\\\Rightarrow 15=2.5+u\sin30^{\circ}(\dfrac{800}{u\sqrt{3}})+\dfrac{1}{2}\times -32.2\times (\dfrac{800}{u\sqrt{3}})^2\\\Rightarrow \dfrac{400}{\sqrt{3}}-\dfrac{10304000}{3u^2}-12.5=0\\\Rightarrow 218.44=\dfrac{10304000}{3u^2}\\\Rightarrow u=\sqrt{\dfrac{10304000}{3\times218.44}}\\\Rightarrow u=125.4\ \text{m/s}

The minimum initial velocity needed for the ball to clear the fence is 125.4\ \text{m/s}

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