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oksian1 [2.3K]
3 years ago
7

What is the next number after 3 -6 12 4 20

Mathematics
1 answer:
Ede4ka [16]3 years ago
3 0
The sequence is alternatingly decreasing and increasing.
3 - 9 = -6
-6 + 18 = 12
12 - 8 = 4
4 + 16 = 20

Therefore, next term will be:
20 - 7 = 13
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The difference between a number and its square is 20. Find the<br>numbers.​
Elena L [17]

Answer:

-4 or 5

Step-by-step explanation:

let number be x

x²-x=20

Rearrange

x²-x-20=0

(x+4)(x-5)=0

Separate

x+4=0, x-5=0

x=-4 or 5

4 0
2 years ago
If Y=-5x-6 What is the value of Y hen.
Scorpion4ik [409]

The value of 'y' is exactly 6 less than the negative fifth multiple of 'x'.


7 0
3 years ago
a vertical pole 10 ft. tall casts a 14-foot shadow. what is the angle of elevation of the sun to the nearest degree?
PtichkaEL [24]
Draw a right triangle.

tan(theta) = \frac{opposite}{adjacent}

tan(theta) = \frac{10}{14}

Arctangent (tan^-1) can be used to find theta.

tan^{-1}(\frac{10}{14})=theta

theta\ is\ approx\ \boxed{36\ degrees}

8 0
3 years ago
2х - Зу = 32<br> x + 4у = -20<br><br><br> solve the system of equations
ANTONII [103]
Answer: x=68/11 and y=-72/11


Steps:

2(x+4y=-20)

2x+8y=-40

2x - 3y = 32
- 2x + 8y = -40

-11y=72

y=-72/11


x + 4(-72/11) = -20

x - 288/11 = -20

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5 0
2 years ago
PLEASE HELP!!!!! The velocity of sound in air is given by the equation , where v is the velocity in meters per second and t is t
jeyben [28]

The equation of velocity of sound in air is v = 20 √(273 + t). In this problem, we need to find the temperature when the velocity is 329 meters/s. You need to measure the time it takes a sound to travel a measured distance in order to measure its speed in air.

 

Given:

Velocity of sound in air equation = v = 20 √(273 + t)

Velocity = 329 m/s

 

To solve:

V = 20 √(273 + t)

<span>
329 = 20 * sqrt(273 + t)</span>

<span>
16.45 = sqrt(273 + t)</span>

<span>
273 + t = 16.45^2</span>

<span>
t- 16.45^2-273</span>

<span>
t = -2.4 degrees Celsius</span>

 

<span>So, the temperature when the velocity is 329 meters per second is -2.4 degrees Celsius.</span>

3 0
3 years ago
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