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3 years ago

The square of a number is 6 more than 5 times the number. What is the number?

1 answer:

8 0

X^2 = 6+5x => x^2 - 5x - 6 = 0 => (x-6)(x+1)=0

This riddle has two solutions:

x=6 or x=-1

indeed 6*6 = 36 = 5*6+6
indeed -1*-1 = 1 = 5*-1 + 6

The -1 is kind of a surprise, isn't it?

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An airplane is flying at an altitude of 40,000 feet. To avoid turbulence the pilot descends at a rate of 2,000 feet / minute for

FromTheMoon [43]

Answer:

The plane is now flying at an altitude of 42,250 feet.

Step-by-step explanation:

Initially, he is at an altitude of 40,000 feet.

Descends at a rate of 2,000 feet / minute for 3 minutes.

So his altitude is now:

40,000 - 3*2,000 = 34,000

Ascends at a rate of 1,500 feet minute for 5.5 minutes.

The plane is now flying at an altitude of:

34,000 + 1,500*5.5 = 42,250

The plane is now flying at an altitude of 42,250 feet.

5 0

3 years ago

<img src="https://tex.z-dn.net/?f=what%20is%20the%20square%20root%20of%2018" id="TexFormula1" title="what is the square root of

Arturiano [62]

Answer:

sqrt(18) = 4.24264069

8 0

3 years ago

Explain what their first step would be if they wanted to eliminate the y variable from the equations.

Vinvika [58]

Answer:

r1 +4×r3 ⇒ r1
r2 -3×r3 ⇒ r2

Step-by-step explanation:

We note that the coefficient of y in equation (iii) is 1, so it is convenient to use that equation to eliminate y from the others.

To eliminate the y-variable from equation (i), four times equation (iii) can be added to equation (i).

To eliminate the y-variable from equation (ii), three times equation (iii) can be subtracted from equation (i).

_____

The result of these operations would be ...

$10x +6z = 28\quad\text{(iv)}\\\\-7x-9z=2\quad\text{(v)}$

5 0

2 years ago

Find the difference : 1 - 0.4308 PLEEASE ANSWER WILL MARK BRAINLIEST PLEASE ANSWER

tiny-mole [99]

Answe - 0. 5692

Step-by-step explanation:

the step is only to let 1 be 10000 and then subtract 4308 from 10000 and it u have any confusion then u can also check it by adding the answer with 4308

and that's it.

If u think it's helpful then plz share to ur friends too.

4 0

2 years ago

The sum of three consecutive even numbers is 54 . find the numbers .

victus00 [196]

<h3>Answer :- </h3>

Let the three consecutive numbers be x -2 , x and x + 2
Their sum = ( x - 2 ) + ( x + 2 ) = 3x
This is the given equal to 54

3x = 54 or x = 54/3
x = 18

Thus , the required numbers are 16 , 18 , 20

5 0

2 years ago