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3 years ago

11

A plane ticket cost see dollars for an adult and K dollars for a child find an expression that represents the total cost for thr

ee adults and nine children

1 answer:

tiny-mole [99]3 years ago

8 0

If one adult ticket costs $c$ , then three adult tickets cost $3c$

Similarly, if one child ticket costs $k$ , then nine child tickets cost $9k$

So, in total, the price will be

$3c+9k$

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andrey2020 [161]

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3 years ago

A commercial jet can fly 868 miles in 2 hours with a tailwind but only 792 miles in 2 hours into a headwind. Find the speed of t

erik [133]

Answer:

The speed of the jet in still air is 415 mph and the speed of the wind is 19 mph

Step-by-step explanation:

we know that

The speed is equal to divide the distance by the time

Let

x -----> the speed of the wind in miles per hour

y ----> the speed of the jet in still air in miles per hour

we know that

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$y+x=\frac{868}{2}$

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<em>With a headwind</em>

$y-x=\frac{792}{2}$

$y-x=396$ ----> equation B

solve the system of equations A and B by elimination

Adds equation A and equation B

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<em>Find the value of x</em>

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therefore

The speed of the jet in still air is 415 mph and the speed of the wind is 19 mph

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