Why were most peppered moths dark in the 1959 era but light in the 2000s?

Answer:

12

Step-by-step explanation:

because i said so

Answer:

B and C are correct

Step-by-step explanation:

Answer:

Step-by-step explanation:

x = 40

x = 120

The < sign means less than.

38 is less than 25, but it is less than 40 and 120.

Hope that helps!

-Sabrina

Answer: $44.85

Step-by-step explanation:

$14.95x3

Answer:

91

Step-by-step explanation:

Multiplication first, so 7x4 = 28

28+63=91

Answer:

91

Step-by-step explanation:

multiply the numbers

7×4=28

63+28=91

add the numbers

91

Answer:

Step-by-step explanation:

They say  "solve" the triangle,  means just find all the sides and all the angles is all they are asking by "solve"   .. saying "solve" sounds so ominous  :/  like.. good luck with this... nobody can do it..  :D ..  which there are math questions like that.  soooo anyway,  let's find AC , I'll call is side b , then using law of cosines, where AC = b  , a = 9 and c=21, and angle B = 91°,  then

b = sq rt[ a^2+c^2 - 2*a*c*cos(B) ]

b = sq rt[ 9^2 +21^2 -2*9*21*cos(91)]

b = sq rt [ 81 +441 -378 * (-0.0174524 )]

b = sq rt [ 522 + 6.597]

b = sq rt [528.597]

b = 22.991

side AC = 23.0  ( rounded to nearest 10th)

now that we have all three sides lets use law of sines to solve the angles, b/c it's easier  :P    call me "lazy"  maybe ?    or call me "maybe"   :D :D  the song, ofc.   :D anyway

sin(91) / 22.991 = sin(C) /21

arcSin [ 21*sin(91) / 22.991] = C

arcSin[ 0.91326 ] = C

65.96 ° = C

C = 66.0 °

and then the same for angle A

Sin(91)/22.991 = sin(A) / 9

arcSin [ 9* sin(91) / 22.991 ] = A

arcSin [ 0.3913979 ] =A

23.04 ° = A

A = 23.0 °

let's add up the 3 angles to see if we get 180 or very very close

180.0015 °  ohh that's pretty close , nice I think the answers are right :P

23 +66+91=180  so the rounding to the nearest 10th makes them perfect , great ,  :)

Answer:

I think there is no solution

Step-by-step explanation:

Answer:

y = 6

Step-by-step explanation:

This is a special right triangle with angle measures 90° 60° 30°

the side length that sees angle measure 30 is represented with x

the side length that sees angle measure 90 is represented with 2x

and the side length that sees angle measure 60 is represented with x√3

the side length that sees angle measure 90 is given as 4√3 which means 2x = 4√3 divide both sides by 2

x = 2√3 now to find y, we need to multiply this value by √3

2√3 × √3 = 2 × 3

Answer:

78

Step-by-step explanation:

Remark

There are two similar triangles in the diagram: ΔYZX and  ΔVWX.

That being true a ratio can be set up as

VW / ZY = WX / XZ

Givens

VW = 104

ZY = 8

WX = ?

XZ = 6

Solution

104 / 8 = WX / 6

104 * 6 / 8 = WX

WX = 78

So the width of the lake is 78 meters

Answer:

angle 1 and 4 are vertical angles

angle 1 plus angle 2 = angle 4

angle 2 and angle 7 are all of the above

Step-by-step explanation:

1. complementary angles are angles that have a sum of 90. because the angles are vertical angles they are congruent so the angles are likely not going to equal 45 degrees

vertical angles are angles that are vertically aligned with each other

adjacent angles are angles that share a common vertex, because these angles are not right next to each other they do not share a common vertex hence they are not adjacent angles

2. The answer choice shows the proof that an exterior angle is equal to the sum of its opposite interior angles

angle 4 being the opposite angle and angles 1 and 2 being opposite interior angles

3 The image shown is an example of corresponding angles

From looking at the image and then looking at the question we can tell that angles 2 and 7 are corresponding angles

Corresponding angles are congruent

Angles 2 and 7 are also obtuse angles. We know this because the angle formed is larger than a right angle

Answer:

1 &4 are vertically opposite angle

angle 1+angle 2=angle 4 exterior angle of the triangle is equal to the sum of two opposite interior angle

angle 2 and angle 7 are corresponding angle

Answer:

F(-3)=2(-3)^2-(-3)

      =2(9)+3

      =18+3

      =21

Step-by-step explanation:

Answer:

30 days

Step-by-step explanation:

Answer:

p-3 is the correct answer

Answer:

p - 3

Step-by-step explanation:

let x = number of pretzels terry ate and p = the amount of pretzels susan ate

If Terry ate 3 less than Susan than

x would equal p - 3

so your answer would be p - 3

Answer:

Step-by-step explanation:

area = (5x-3)² = (25x² - 30x + 9) cm²

Answer: D

Sound waves with higher amplitudes sound louder than sound waves with lower amplitudes. Constructive interference will make a sound louder while destructive interference will make a sound quieter. Two waves that add together may have different frequencies.

Answer:

130.25 ft.

Step-by-step explanation:

The semi circle has a length 1/2 of the circumference of the circle with a diameter of 25

C = πd = 3.14(25)

So, the semi circle has a length = 1/2(3.14)25) = 39.25

The distance for the rectangle = 33 + 25 + 33 = 91

Therefore, the total perimeter = 91 + 39.25 = 130.25

Carbon-14 will take 19,035 years to decay to 10 per cent.

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay.

An exponential decay can be described by the following formula:

[tex]N(t)=N_oe^{-\lambda t}[/tex]

Where:

No  = The quantity of the substance that will decay.

N(t) = The quantity that still remains and has not yet decayed after a time t

[tex]\lambda[/tex]    = The decay constant.

One important parameter related to radioactive decay is the half-life:

[tex]t_{1/2}=\dfrac{Ln(2)}{\lambda}[/tex]

If we know the value of the half-life, we can calculate the decay constant:

[tex]\lambda =\dfrac{ln(2)}{t_{1/2}}[/tex]

Carbon-14 has a half-life of 5,730 years, thus:

[tex]\lambda =\dfrac{ln(2)}{5730}[/tex]

[tex]\lambda[/tex] = 0.00012097

The equation of the remaining quantity of Carbon-14 is:

[tex]N(t)=N_oe^{-0.00012097t}[/tex]

We need to calculate the time required for the original amount to reach 10%, thus N(t)=0.10No

[tex]0.10N_o=-N_oe^{-0.00012097t}[/tex]

Simplifying:

[tex]0.10=e^{0.00012097t}[/tex]

Taking logarithms:

ln(0.10) = -0.00012097t

Solving for t:

[tex]t=\dfrac{Log0.10}{-0.00012097}[/tex]

t = 19035 years

Carbon-14 will take 19,035 years to decay to 10 per cent.

To know more about decay follow

https://brainly.com/question/25537936

#SPJ2

First answer is 6+x

2. A.37419

  B. 7

Answer:

Range: {-1, 0, 1}

General Formulas and Concepts:

Math

Algebra I

Step-by-step explanation:

Step 1: Define

[Relation] {(-4, 1), (-2, 0), (8, -1)}

Step 2: Identify

According to the relation, our y-values are 1, 0, and -1. These values would encompass our range.

Answer:

340 liters

Step-by-step explanation:

This means that Tapiwah raked x plus 5% of x leaves. Knowing that Tapiwah actually raked 357 liters, we can find the value of x as follows. So, Adam raked 340 liters of leaves.

Answer:

8/36

Step-by-step explanation:

Answer: there is no pic

Step-by-step explanation:

Answer:

6.4 tons

Step-by-step explanation:

Answer:

can you turn the picture over please so I can be able to read it

Answer:

-6 , 6, 11

Step-by-step explanation:

Set each part of the equation to zero, so that x-11= 0, and x^2 - 36 = 0. Solve each part, and you get -6, 6, and 11.

Hopefully this helps- let me know if you have any questions!

Answer: a: divide by 3 on both sides

B: add 3 to both sides

C: multiply by -3 on both sides

D: divide by -3 on both sides

E: add 1/3 to both sides

F: subtract 3 from both sides

G: multiply by 3 on both sides

H: subtract 1/3 from both sides.

Step-by-step explanation:

Answer:

0 and the second one

Step-by-step explanation:

integers are whole numbers they are NOT a fraction

Answer:

0, 21/7

Step-by-step explanation:

fraction is not an integer so is square root

and 10^-1 is 0.1 which is not a integer

Answer:

Roberto can buy up to 7 video games max.

Step-by-step explanation:

max Roberto can spend = $200

video game = $25.50 each

equation:

25.50g = 200

divide each side by 25.50:

[tex]\frac{25.50g}{25.50} = \frac{200}{25.50}[/tex]

= 7.84

7 video games x 25.50 each = 178.50

200 - 178.50 = 21.50 remaining

Answer:

its side CE

Step-by-step explanation:

I got it wrong and it showed me the answer. Hope this helps!

Answer:

C

Step-by-step explanation:

got it right