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Degger [83]
3 years ago
6

​Dolbear's law states the relationship between the rate at which Snowy Tree Crickets chirp and the air temperature of their envi

ronment. The formula is Upper T equals 50 plus N minus 40 Over 4, where T is a temperature in degrees Fahrenheit and N is a number of chirps per minute. If n=66
Mathematics
1 answer:
erastovalidia [21]3 years ago
4 0
25.21 this is corect :D

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A STORY OF UNITS
Aleks04 [339]

Answer:

<em>$40 </em>will be the total cost of the ribbon.

Step-by-step explanation:

To find the cost of ribbon to be put on the edges of rectangular banner, we need to:

1. Find the perimeter of the rectangle.

2. Multiply the perimeter with the per foot cost to find the total cost.

Let us find the perimeter first:

Perimeter of a rectangle is given as:

P = 2 \times \text{(length+width)}

Here, the dimensions of rectangle are 4ft by 6ft.

So, perimeter = 2 \times (4+6) \Rightarrow 20\ ft

It is given that per foot cost is $2.

Total cost of the ribbon = 2 \times 20 \Rightarrow $40

<em>$40 </em>will be the total cost of the ribbon.

7 0
4 years ago
I need help please ????????
olga55 [171]

Answer:

5,150 bigger

Step-by-step explanation:

5,500-350= that answer hope this helps

4 0
3 years ago
On the fastest speedways, some drivers reach average speed of 3 miles per minute. Write a formula that gives the number of miles
kondor19780726 [428]
<span>The formula is M = 3x
The distance is 3(33) = 99 mi.</span>
7 0
3 years ago
Which summation formula represents the series below?<br><br> 13 + 9 + 5 + 1
Ket [755]

Answer:

The summation formula for the series is ⇒ 15n - 2n²

Step-by-step explanation:

* Lets check the series 13 , 9 , 5 , 1

∵ 9 - 13 = -4

∵ 5 - 9 = -4

∵ 1 - 5 = -4

∴ The series has a common difference

∴ It is an arithmetic series with first term <em>a</em> and constant difference <em>d</em>

* That means

- a1 = a , a2 = a + d , a3 = a + 2d , a4 = a + 3d

∴ an = a + (n - 1)d, where <em>n</em> is the position of the number in the series

* The sum of the arithmetic series can find by the rule

- Sn = n/2[2a + (n - 1)d], where <em>n</em> is the number of terms you want to add

* Lets use this rule in our problem

∵ Sn = n/2[2(13) + (n - 1)(-4)]

∴ Sn = n/2(26 + (-4n + 4)] ⇒ open the small bracket

∴ Sn = n/2[26 - 4n + 4] ⇒collect the like terms

∴ Sn = n/2[30 - 4n] ⇒ open the bracket

∴ Sn = (n/2)(30) - (n/2)(4n)

∴ Sn = 15n - 2n²

* The summation formula for the series is 15n - 2n²

7 0
3 years ago
Read 2 more answers
Find the LCM of the numbers using lists of multiples.
Aleksandr-060686 [28]
LCM answers:

1. 28

2. 60

3. 84
3 0
3 years ago
Read 2 more answers
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