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3 years ago

HELP PLS SIMPLE SIMPLESIMPLE

Mathematics

2 answers:

liubo4ka [24]3 years ago

6 0

Answer:

3√ 5

Step-by-step explanation:

alukav5142 [94]3 years ago

4 0

Answer:

3 $\sqrt{5}$

Step-by-step explanation:

$\sqrt{45}$

$\sqrt{9*5}$

3 $\sqrt{5}$

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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 <u>to</u> the airport (in mph)

⇒ v + 15 = average speed driving <u>from</u> 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

2 years ago

Read 2 more answers

The amount of money that Mary earns varies directly with the number of hours worked. If Mary earns $320 for working 40 hours,

Nostrana [21]

Answer:

(c) 8

Step-by-step explanation:

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3 years ago

Which points are the foci of the ellipse?

Mazyrski [523]

The foci need to be equal distances from the center of the eclipse.

See the attached picture. I marked off all the points that were given as choice and from this you can see that that (-5,-4) and (-5,2) are both 3 units away from the center.

The answer is: (-5,-4) and (-5,2)

7 0

3 years ago

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A segment XD is drawn in rectangle QUAD as shown below. Rectangle Q U A D. Segment X goes from side U A to point D to form a tri

frez [133]

Answer:

the answer is 41, 139

3 0

3 years ago

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56 = ?×?×?×? i want to know what number ecual yo 56 by multiplying it 4 times to get your answer

erma4kov [3.2K]

Answer:

4 * 14 = 56

Step-by-step explanation:

56/2 = 28

28/2 = 14

14/2 = 7

7/7 = 1

56 = 2 * 2 * 2 * 7

56 = (2 * 2) * (2 * 7)

56 = 4 * 14

7 0

3 years ago