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3 years ago

A train travels 91 kilometers in 2 hours, and then 97 kilometers in 3 hours. What is its average speed?

Mathematics

1 answer:

Andrei [34K]3 years ago

6 0

I think the average spend is 11 km. i don't know for sure..

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If y is 6 when x is 3 and y varies directly with x, find y when x is 8. 04 16 11

Zarrin [17]

Answer

y = kx

from the info given k=2

hence when x=8 y=16:

4 0

3 years ago

Suzanne has a rectangular garden which is 18 feet long and 11 feet wide. She has 168 square foot of paving stones, and she wants

VikaD [51]

Answer:

width = 2.5 feet

Step-by-step explanation:

Suzanne has a rectangular garden which is 18 feet long and 11 feet wide.

Area of the garden = length times width = 18 times 11= 198 square foot

Let 'w' be the width of the border

Length of the garden with border = 18+2w

Width of the garden with border = 11+2w

Area of the garden with border = $(18+2w)(11+2w)=4w^2+58w+198$

Area of the border = $4w^2+58w+198-198=4w^2+58w$

She has 168 square foot of paving stones,

$4w^2+58w=168$

Solve for w

apply quadratic formula

a= 4, b= 58 and c=-168

$\quad x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

$w=\frac{-58+-\sqrt{58^2-4\cdot \:4\left(-168\right)}}{2\cdot \:4}$

$w=\frac{-58+-\sqrt{6052}}{8}$

we get two values for w

$w=\frac{-58+\sqrt{6052}}{8}=2.47$

$w=\frac{-58-\sqrt{6052}}{8}=-16.97$

5 0

3 years ago

What is the value of x =》 6x + 6 = 42

otez555 [7]

Answer:

x = 6

Step-by-step explanation:

6x + 6 = 42

6x = 42 - 6

6x = 36

x = 36 / 6

x = 6

hope it helps :)

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3 years ago

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Answer:

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4 years ago