An endangered species has only 450 animals remaining in the wild. The population decreases by 10% each year. Write an equation to describe the number of animals left after x years.​

Answer:

130

Step-by-step explanation:

Angle B = 180 - Angle A

180 - 50 = 130

Answer:

The answer is 130 degrees.

Step-by-step explanation:

A+B should be 180, so with A being 50; B has to be 130.

Answer:

I belive the answer will be 28,350

Answer:

you need common denominater so 10/10 - 9/10 =1/10 thats how much of her money she used.

Step-by-step explanation:

Answer:

1.

It has two solution because it is in quadratic form.

2.

(x-4)²-28=8

x²-8x+16-28-8=0

x²-8x-20=0

Doing middle term factorization

x²-(10-2)x-20=0

x²-10x+2x-20=0

x(x-10)+2(x-10)

(x-10)(x+2)=0

either

x=10

or

x=-2

:. x= 10 or -2

3.

2x²-5x-5=0

Comparing above equation with ax²+bx +c

we get

a=2

b=-5

c=-5

quadratic equation is

[tex]x = \frac{ - b ± \sqrt{ {b}^{2} - 4ac} }{2a} [/tex]

Substituting value

[tex]x = \frac{ 5 ± \sqrt{ {-5}^{2} - 4×2×-5} }{2×-5} [/tex]

-10x=5±[tex] \sqrt{ {25+ 40}}[/tex]

taking + ve

-10x=5+[tex] \sqrt{ {65}}[/tex]

x=-½-[tex] \frac {\sqrt{ {65}}}{10}[/tex]

taking -ve

x=-½+[tex] \frac {\sqrt{ {65}}}{10}[/tex]

Answer:

The number 28 should be written in the red box.

Answer:

The Slope Equation = y2 -y1 over X2 - X1

Step-by-step explanation:

1.) Pick every graph

2.) Pick any 2 point in the graph

3.) do the slope equation

4.) the answers must be equal  

Answer:

14.91

Step-by-step explanation:

Have a good day :)

Answer:

The answer is 14.91

Step-by-step explanation:

To find the answer we must first see how many times 5 can go into 74.55.  Since 5 x 14.91 = 74.55, then it means that our answer is 14.91.  

Answer:

The average speed on Monday is 27mph

Step-by-step explanation:

Given

Let:

[tex]1\to Sunday[/tex]

[tex]2\to Monday[/tex]

So:

[tex]t_1 = 5.4hr[/tex]

[tex]t_2 = 6hr[/tex]

[tex]s_2 = s_1 - 3[/tex] ---- average speed slower on Monday than Tuesday

Required

The average speed on Monday

Average speed is calculated as:

[tex]Speed = \frac{Distance}{Time}[/tex]

[tex]s = \frac{d}{t}[/tex]

Make d the subject

[tex]d = st[/tex]

On Sunday, we have:

[tex]d = s_1t_1[/tex]

[tex]d = s_1 * 5.4[/tex]

On Monday, we have:

[tex]d = s_2t_2[/tex]

[tex]d = s_2 * 6[/tex]

The distance traveled is constant;

So:

[tex]s_1 * 5.4 = s_2 * 6[/tex]

Make s1 the subject in: [tex]s_2 = s_1 - 3[/tex]

[tex]s_1=3+s_2[/tex]

So, we have:

[tex](3 + s_2) * 5.4 = s_2 * 6[/tex]

Open bracket

[tex]16.2 + 5.4s_2 = 6s_2[/tex]

Collect like terms

[tex]6s_2 - 5.4s_2 = 16.2[/tex]

[tex]0.6s_2 = 16.2[/tex]

Solve for s_2

[tex]s_2 = 16.2/0.6[/tex]

[tex]s_2 = 27[/tex]

The average speed on Monday is 27mph

Answer:

B.   x = -4

Step-by-step explanation:

- 7x - 35 = -7

add 35 to both sides

-7x = 28

Divde both sides by -7

x = -4

Answer: X = -4

Step-by-step explanation:

-7x - 35 = -7

-7x = -7 + 35

-7x = 28

x = -4

Answer:

See below

Step-by-step explanation:

[tex] m\angle 1 = 180\degree - (90+39)\degree = 51\degree [/tex]

[tex] m\angle 2= 90\degree -51\degree =39\degree [/tex]

[tex] m\angle 3= 90\degree[/tex]

[tex] m\angle 4 = 180\degree - (90+39)\degree = 51\degree [/tex]

[tex] m\angle 5 = 180\degree - (129+34)\degree = 17\degree [/tex]

[tex] m\angle 6 = 90\degree +39\degree = 129\degree [/tex]

Answer:Darla's fraction of the windows was 4/9 greater than Cindy's.

Step-by-step explanation:

Fraction of the window washed by Darla =5/9

Fraction of the window washed by Cindy=1/9

To find How much greater  Darla's fraction of the windows was than Cindy's, we subtract ,

5/9-1/9=4/9

Thetrefore, Darla's fraction of the windows was 4/9 greater than Cindy's.

Answer:

4/9

Step-by-step explanation:

Answer:15

Step-by-step explanation:

Answer:

30%

Step-by-step explanation:

The percentage of something can be calculated by dividing that number by the total amount. In this scenario, you divide 12 by 40

12/40 = 0.3

Or, you could do it the way without doing the math and simplifying to make it easier

12/40 = 6/20 = 3/10 = 0.3 = 30%

Answer:

A   145/360 * 38

Step-by-step explanation:

Step-by-step explanation:

Answer:

x = -17/4

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Distributive Property

Equality Properties

Algebra I

Step-by-step explanation:

Step 1: Define

Identify

3x + 5(2 + x) = 4x - 7

Step 2: Solve for x

Answer:

x=[tex]\frac{-17}{4}[/tex]

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

3x+5(2+x)=4x−7

3x+(5)(2)+(5)(x)=4x+−7(Distribute)

3x+10+5x=4x+−7

(3x+5x)+(10)=4x−7(Combine Like Terms)

8x+10=4x−7

8x+10=4x−7

Step 2: Subtract 4x from both sides.

8x+10−4x=4x−7−4x

4x+10=−7

Step 3: Subtract 10 from both sides.

4x+10−10=−7−10

4x=−17

Step 4: Divide both sides by 4.

[tex]\frac{4x}{4}[/tex]=[tex]\frac{-17}{4}[/tex]

x=[tex]\frac{-17}{4}[/tex]

Answer:

let x =the original price

then 116x/100=$39.32

116x=100×39.32

116x=3932

divide both sides by 116

116x/116=3932/116

x=33.89655

(2dp)

x=33.90

Answer:

- the pressure will decrease

(volume is doubled ,the pressure reduced by half).

Step-by-step explanation:

P_1 V_1=P_2 V_2

This equation shows that, as volume increases, the pressure of the gas decreases in proportion.

Similarly, as volume decreases, the pressure of the gas increases.

Answer: [tex]\dfrac{1}{\sqrt{2}}[/tex]

Step-by-step explanation:

The value of [tex]\cos 45^{\circ}[/tex] is the fixed value i.e. [tex]\frac{1}{\sqrt{2}}[/tex]

The values of cosine changes from a maximum at [tex]0^{\circ}[/tex] to a minimum at [tex]180^{\circ}[/tex]

for example, [tex]\cos 0^{\circ}=1, \quad \cos 90^{\circ}=0,\quad \cos 180^{\circ}=-1[/tex]

Answer:

-24·[tex]\sqrt{35}[/tex]

Step-by-step explanation:

Answer:

I think 230

Step-by-step explanation:

hope it's help.

Answer:

Solve by factoring.

1. 2x^2+9x+26=-4x+5

2x²+9x+4x+26-5=0

2x²+13x+21=0

doing middle term factorization

2x²+7x+6x+21=0

x(2x+7)+3(2x+7)=0

(2x+7)(x+3)=0

either

x=-7/2

or

x=-3.

2.

3x^2-6x-4=0

comparing above equation with ax²+bx+c=0

we get

a=3

b=-6

c=-4

By using quadratic equation

x=[tex] \frac{ - b±\sqrt{ {b}^{2} - 4ac } }{2a} [/tex]

Substituting value

x=[tex] \frac{ 6±\sqrt{ {-6}^{2} - 4*3*-4 }}{2*-4} [/tex]

x=[tex] \frac{ 6±\sqrt{ {84}}}{-8} [/tex]

x=[tex] \frac{ 6±2\sqrt{ {21}}}{-8} [/tex]

-8x=6±2√21

taking positive

-8x=6+2√21

x=[tex] \frac{6+2√21}{-8} [/tex]

x=-[tex] \frac{3+√21}{4} [/tex]

taking negative

-8x=6-2√21

x=[tex] \frac{6-2√21}{-8} [/tex]

x=-[tex] \frac{3-√21}{4} [/tex]

Answer:

Option 4

Step-by-step explanation:

So formula of voulme of the cube is a³

We have the side length is 6x

So sub the value in formula we get 216x³

Answer:

D

Step-by-step explanation:

Answer:

B is correct: 3x=40

Step-by-step explanation:

just cross multiply and mark brainliest if you feel like it :)

Answer:

3x =40

Step-by-step explanation:

3 will cross multiply with x then 4 will multiply 10

Hence 3x=40

Step-by-step explanation:

you will add the powers 4×+2=6×

then(-2)^6