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serious [3.7K]
2 years ago
11

Several people are standing in line. Starting at 1 end, Santa is the 3rd person. Starting at the other end, he's the 11th person

. How many people are standing in line?​
Mathematics
1 answer:
OlgaM077 [116]2 years ago
3 0

there are 13 people in line

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2a² - a - 13 =2 I want to see the steps how its done​
sammy [17]

Answer:

Step-by-step explanation:

2a^-a-13=2

Subtract 2 from both sides :

2a^2-a-13=2=2-2

2a^2-a-15=0

Factor left side of the equation :

(2a+5) (a-3)=0

Set factors equal to 0 :

2a+5=0 or  a-3=0

a=-5/2   or a=3

8 0
3 years ago
Round 35,375 to the nearest ten thousand
kondaur [170]

Answer:40,000

Step-by-step explanation: if the last 4 digits are 5,000 or grater round up to the next number if it’s less keep the number the same

3 0
3 years ago
Two airplanes are flying in the air at the same height: airplane A is flying east at 250 mi/h and airplane B is flying north at
just olya [345]

Answer:

  decreasing at 390 miles per hour

Step-by-step explanation:

Airplane A's distance in miles to the airport can be written as ...

  a = 30 -250t . . . . . where t is in hours

Likewise, airplane B's distance to the airport can be written as ...

  b = 40 -300t

The distance (d) between the airplanes can be found using the Pythagorean theorem:

  d^2 = a^2 + b^2

Differentiating with respect to time, we have ...

  2d·d' = 2a·a' +2b·b'

  d' = (a·a' +b·b')/d

__

To find a numerical value of this, we need to find the values of its variables at t=0.

  a = 30 -250·0 = 30

  a' = -250

  b = 40 -300·0 = 40

  b' = -300

  d = √(a²+b²) = √(900+1600) = 50

Then ...

  d' = (30(-250) +40(-300))/50 = -19500/50 = -390

The distance between the airplanes is decreasing at 390 miles per hour.

3 0
3 years ago
Please help :) <br> Due asap and thx!
Elenna [48]

Answer:

b . 6 is the length of the hypotenuse

8 0
2 years ago
A car travled 200 miles in 4 hours . What was the car average rate of speed in miles per hour ?
Dahasolnce [82]

rate = 200 miles/ 4 hours = 50 miles/hour

7 0
3 years ago
Read 2 more answers
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