7. If the value of x varies directly with the value of y, and x = 3 when y = 21. What is the valu

2 answers:

6 0

So basically

When x = 3 , y= 21

3/21 = x/105

What number times 21 is equal to 105?
21* 5 = 105

So 3* 5 = 15

When x= 15, y= 105

Hope this helps!

konstantin123 [22]2 years ago

3 0

Answer:

Step-by-step explanation:

Because x=y÷7

i.e,105÷7=15

You might be interested in

PLEASE HELP! 50 Points!

gulaghasi [49]

The bearing of the plane is approximately 178.037°. $\blacksquare$

<h3>Procedure - Determination of the bearing of the plane</h3><h3 />

Let suppose that <em>bearing</em> angles are in the following <em>standard</em> position, whose vector formula is:

$\vec r = r\cdot (\sin \theta, \cos \theta)$ (1)

Where:

$r$ - Magnitude of the vector, in miles per hour.
$\theta$ - Direction of the vector, in degrees.

That is, the line of reference is the $+y$ semiaxis.

The <em>resulting</em> vector ( $\vec v$ ), in miles per hour, is the sum of airspeed of the airplane ( $\vec v_{A}$ ), in miles per hour, and the speed of the wind ( $\vec v_{W}$ ), in miles per hour, that is:

$\vec v = \vec v_{A} + \vec v_{W}$ (2)

If we know that $v_{A} = 239\,\frac{mi}{h}$ , $\theta_{A} = 180^{\circ}$ , $v_{W} = 10\,\frac{m}{s}$ and $\theta_{W} = 53^{\circ}$ , then the resulting vector is: