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2 years ago

Please help this is the last question on my test!! What is the approximate area of a circle with a radius of 4 feet? Use 3.14

Mathematics

2 answers:

Angelina_Jolie [31]2 years ago

4 0

Answer:

50 feet²

Step-by-step explanation:

r = 4 feet

Area of circle = $\pi$ r²

= 3.14 * 4 * 4

= 50.24 = 50 feet²

earnstyle [38]2 years ago

4 0

Answer:

50.24 square feet

Step-by-step explanation:

area = π $r^{2}$

area = 3.14 x 4ft

area = 50.24 $ft^{2}$

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2 years ago

Rolf spent 15 hours last week practicing his saxophone if 3/10 of the time was spent practicing warm up routines, how much time

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2 years ago

What is the solution for x>16

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Step-by-step explanation:

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2 years ago

Dwayne drove 18 miles to the airport to pick up his father and then returned home. On the return trip he was able to drive an av

Nesterboy [21]

Answer:

30 mph

Step-by-step explanation:

Let d = distance (in miles)

Let t = time (in hours)

Let v = average speed driving to the airport (in mph)

⇒ v + 15 = average speed driving from the airport (in mph)

Using: distance = speed x time

$\implies t=\dfrac{d}{v}$

Create two equations for the journey to and from the airport, given that the distance one way is 18 miles:

$\implies t=\dfrac{18}{v} \ \ \textsf{and} \ \ t=\dfrac{18}{v+15}$

We are told that the total driving time is 1 hour, so the sum of these expressions equals 1 hour:

$\implies \dfrac{18}{v} +\dfrac{18}{v+15}=1$

Now all we have to do is solve the equation for v:

$\implies \dfrac{18(v+15)}{v(v+15)} +\dfrac{18v}{v(v+15)}=1$

$\implies \dfrac{18(v+15)+18v}{v(v+15)}=1$

$\implies 18(v+15)+18v=v(v+15)$

$\implies 18v+270+18v=v^2+15v$

$\implies v^2-21v-270=0$

$\implies (v-30)(v+9)=0$

$\implies v=30, v=-9$

As v is positive, v = 30 only

So the average speed driving to the airport was 30 mph

(and the average speed driving from the airport was 45 mph)

8 0

1 year ago

Read 2 more answers