I need help. trying to solve this.

Mathematics

1 answer:

kkurt [141]2 years ago

8 0

You can use this formula
${x}^{2} + (a + b)x + ab$
a and b are the solutions to the equation

${x}^{2} + ( - \frac{2}{5} + \frac{1}{3} )x + ( - \frac{2}{5} \times \frac{1}{3} ) = 0 \\ {x}^{2} - \frac{1}{15}x - \frac{2}{15} = 0$

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Sketch the situation if necessary and use related rates to solve. Two airplanes are flying in the air at the same height. Airpla

Alexeev081 [22]

Answer:

-390 mph

Step-by-step explanation:

Let a and b represent, respectively, the distances of A and B from the airport. The distance d between the planes is then given by the Pythagorean theorem as ...

d² = a² + b²

Differentiating with respect to time, we have ...

2d·d' = 2a·a' +2b·b'

Solving for d', we get ...

d' = (a/d)a' +(b/d)b'

The value of d at the time of interest is ...

d = √(a² +b²) = √(30² +40²) = √2500 = 50

Then the rate of change of separation is ...

d' = (30/50)(-250 mph) +(40/50)(-300 mph) = (-150 -240) mph

d' = -390 mph

The distance between planes is decreasing at 390 miles per hour.

4 0

3 years ago

I'm awful at word problems someone please help

Lubov Fominskaja [6]

Your answer is B.

Flat fee is $250, so we cannot change this number.
585 - 250 = 335
335 (remaining cash) divided by 8 (price per student) = 41.875
Since we can't bring .8 of one student on the trip, we will round the number down to 41, because if we round up we will go over the budget of $585.

The maximum number of students a school can send is 41.

6 0

2 years ago

Read 2 more answers

Please help !!!!!! <br><br> -2x - 5 = -11

Anna35 [415]

Answer:

x=3

Step-by-step explanation:

So -11 + 5 = -6, not -16.

Then divide -6 and -2x by -2 and x=3

6 0

3 years ago