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3 years ago

0.25k+1.5-k-3.50.25k+1.5−k−3.5. please I need help who ever answers it first will become brainliest

Mathematics

1 answer:

Vilka [71]3 years ago

5 0

Answer:

0.25k+1.5−k−3.5

Subtract k from 0.25k.

−0.75k+1.5−3.5

Subtract

3.5 from 1.5.

−0.75k−2

Step-by-step explanation:

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A triangle has two perpendicular sides that are the same length.

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Answer:

isosceles, right

Step-by-step explanation:

perpendicular lines means that they make 90° angle with each other and for a triangle to be isosceles it has to have 2 sides of equal length

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Assume a random sample of size n is from a normal population. Assume a single sample t test is used to for hypothesis testing. T

valentinak56 [21]

Answer:

True

Step-by-step explanation:

Type I and Type II are not independent of each other - as one increases, the other decreases.

However, increases in N cause both to decrease, since sampling error is reduced.

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3 years ago

The sum of Alan’s age and Bob’s age is 40.

Nutka1998 [239]

Carl is 2 yrs older than bob. Because Alan+Carl is 2 more than Alan+bob
So bob=16 and Carl is 18
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And Alan is 24

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3 years ago

1. Jordan's washing machine is broken. Since her machine is pretty old, she doesn't want to spend more than $100

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Answer:

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3 years ago

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It takes a train 60 seconds to completely drive through a bridge of 1260 m, and 90 seconds to completely drive through a tunnel

Olegator [25]

The length of train is 120 meters

The speed of train is 25 meter per second

Solution:

The speed is given by formula:

$speed = \frac{distance}{time}$

Given that,

It takes a train 60 seconds to completely drive through a bridge of 1260 m

And 90 seconds to completely drive through a tunnel of 2010 m

Let the length of the train be "x"

The total distance travelled by the train across the bridge is given by:

total distance = x + 1260 + x = 2x + 1260

[ here we use x + x to represent that train completely drives through bridge ]

The time taken is given as 60 seconds

Therefore, the speed is given as:

$speed = \frac{2x+ 1260}{60}$

The total distance travelled by the train through the tunnel is given by:

total distance = x + 2010 + x = 2x + 2010

The time taken is given as 90 seconds

Therefore, the speed is given as:

$speed = \frac{2x+ 2010}{90}$

The speed of the train was the same in both cases.

Equate both speeds

$\frac{2x+ 1260}{60} = \frac{2x+ 2010}{90}$

$\frac{x+630}{30} = \frac{x+1005}{45}$

$45(x+630) = 30(x+1005)\\\\45x + 28350 = 30x + 30150\\\\45x - 30x = 30150 - 28350\\\\15x = 1800\\\\x = 120$

Thus length of train is 120 meters

Find the speed of train:

$speed = \frac{2x+ 1260}{60}\\\\speed = \frac{2(120) + 1260)}{60}\\\\speed = 25$

Thus speed of train is 25 meter per second

5 0

3 years ago