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2 years ago

15

A plane flies around trip to Philadelphia it flies to Philadelphia at 220 miles per hour and back home with a tailwind at 280 mi

les per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip

1 answer:

White raven [17]2 years ago

8 0

it is 1,601.6 just took test....

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The price of a hamburger at McBeef’s increased from 50 cents to 60 cents. What is the percent increase?

Mashcka [7]

Answer:

20%

Step-by-step explanation:

8 0

2 years ago

After a baseball is hit, the height h (in feet) of the ball above the ground t seconds after it is hit can be approximated by th

lubasha [3.4K]

Answer:

The ball will take 4.05 seconds to hit the ground.

Step-by-step explanation:

we have

$h=-16t^{2}+64t+3$

This is a quadratic equation (vertical parabola) open down

The vertex is a maximum

we know that

The ball hit the ground when h=0

Solve the quadratic equation

For h=0

$-16t^{2}+64t+3=0$

The formula to solve a quadratic equation of the form

$at^{2} +bt+c=0$ is equal to

$t=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$-16t^{2}+64t+3=0$

so

$a=-16\\b=64\\c=3$

substitute in the formula

$t=\frac{-64(+/-)\sqrt{64^{2}-4(-16)(3)}} {2(-16)}$

$t=\frac{-64(+/-)\sqrt{4,288}} {-32}$

$t=\frac{64(-)\sqrt{4,288}} {32}=-0.05\ sec$ ---> the time cannot be a negative number

$t=\frac{64(+)\sqrt{4,288}} {32}=4.05\ sec$

therefore

The ball will take 4.05 seconds to hit the ground.

4 0

2 years ago

Pls help i need help pls

Dovator [93]

Answer:

1. x = 32°

2. x = 28°

3. x = 15°

4. x = 30°

5. x = 40°

6. x = 20°

Step-by-step explanation:

All the angles should add up to 90° as they are complementary.

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2 years ago

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Last night, 80 people attended a lecture at the Smithville Public library. 47 of the attendees were men. What ratio BEST represe

Ganezh [65]

Number of people: 80

Number of Men: 47
Number of Women: 33

Ratio that best represents the number of men and the number of women:
47 : 33

6 0

3 years ago

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Find the surface area of the hemisphere 6cm

lina2011 [118]

Answer:

452.4 cm^2

Step-by-step explanation:

$a = 4\pi {r}^{2} \\ a = 4 \pi \times (6)^{2} \\ a = 452.4 \: cm^{2}$

I hope that is useful for you :)

7 0

2 years ago