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alekssr [168]
3 years ago
15

HEEELLLPPP PLEEAAASEEE

Mathematics
1 answer:
Pavel [41]3 years ago
4 0

Answer:

B.  y = 2.5

Step-by-step explanation:

Diane's average speed=  25/y  km/h.

Ed's speed= (25/y) - 6 km/h.

Ed walks 25-3 = 22 km.

Consider Ed's journey:

Speed = distance / time so:

(25/y) - 6  = 22 / (y + 3)    ( 3 hours longer = y + 3)

(25 /y - 6)(y + 3) = 22

25 + 75/y - 6y - 18 = 22

6y - 75/y = 25 - 18 - 22

6y - 75/y + 15 = 0

6y^2 + 15y - 75 = 0

2y^2 + 5y - 25 = 0

(2y - 5 )(y + 5) = 0

y = 2.5, -5.

y = 2.5   ( as it must be positive.

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Joe says, "I have found an interesting fact! Twenty-five percent of thirty dollars is
Mrrafil [7]

Answer:

<h2>Joe Is Right</h2>

Step-by-step explanation:

Twenty-five percent of thirty dollars is <u>$7.50 </u>

(30 x 25)/100 = $7.50

Thirty percent of twenty-five dollars is<u> $7.50 </u>

(25 x 30)/100 = $7.50

Therefore he is right

I hope this helps

3 0
3 years ago
2x -3&lt; -1 or -3x &lt; -15
pogonyaev

Answer:

x<1 or x>5

Step-by-step explanation:

2x -3< -1 or -3x < -15

Solve them separately then put them back together

2x-3 < -1

Add 3 to each side

2x-3+3<-1+3

2x<2

Divide by 2

2x/2 <2/2

x<1

-3x < -15

Divide each side by -3, remembering to flip the inequality

-3x/3 > -15/-3

x>5

Put them back together

x<1 or x>5

4 0
3 years ago
get 10,000 point//// Let be the world population as of March 23, 2013. Approximately, = 7,073,981,143.
rewona [7]

Answer:

io

Step-by-step explanation:

6 0
3 years ago
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oksian1 [2.3K]
We need to see the graph in order to help
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The Hiking Club is taking another trip. The hike leader's watch shows that they gained 296 feet in altitude from their starting
algol13
Answer: altitude at starting point is -11ft or 11ft below sea level
Step-by-step explanation:
Equation for this situation will be
A = Ag - 11
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Ag = altitude gained.
At starting point, altitude gained is zero, therefore;
A = 0 - 11
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7 0
3 years ago
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