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andriy [413]
3 years ago
8

23.7-2.5x8= Work out

Mathematics
1 answer:
Lubov Fominskaja [6]3 years ago
8 0

Answer:

23.7 -2.5 X 8 = 23.7 - 20

= 3.7

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A theater has 56 rows of seats. If there are 13 seats in the first row, 18 in the 2nd row, 23 in the 3rd row. How many seats are
Anna35 [415]

Answer:

8428

Step-by-step explanation:

According to the Question,

  • Given, A theater has 56 rows of seats. If there are 13 seats in the first row, 18 in the 2nd row, 23 in the 3rd row.

We have a number sequence  13, 18, 23, ...

  • We can say that this is an arithmetic sequence because of the common difference 'd', is equal to 5, and the first term 'a1' is equal to 13.
  • The formula for the sum of an arithmetic sequence with n terms is given is S_n= \frac{n}{2} [2a_1+(n-1)d]S .

Substitute the given values into the equation to solve for the sum of the 56 rows of seats.

S_56= \frac{56}{2}[2(13)+(56-1)(5)]\\S_{56}=28\left[26+275\right]\\S_{56}=28\left[301\right]\\S_{56}=8428

Therefore, there are 8428 seats in all.

4 0
3 years ago
Hey! I hope everyone is doing great so far :) i'll appreciate some help, ty!
ioda
0.2 (y+2) = 0.2y + 0.2(2)
= 0.2y + 0.4
4 0
3 years ago
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Find the missing probability.<br><br> P(A)=13/20,P(A∩B)=13/25,P(B|A)=?
Tju [1.3M]

By definition of conditional probability,

P(B | A) = P(A ∩ B)/P(A) = (13/25) / (13/20) = 20/25 = 4/5

4 0
3 years ago
Length = 4 + x Width = x Height = x2 + 1 What is the base area of Box 3?
Simora [160]

Answer:

Base area of box = x^2 +4

Step-by-step explanation:

Length = 4+x

Width = x

Height = x^2 + 1

Base area of a rectangular box is a rectangle

Area of a rectangle (base area)= length times width

Length = 4+x

Width = x

Base area = (4+x) \cdot x

Multiply x inside the parenthesis

Base area of box = 4x +x^2

8 0
3 years ago
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GEOMETRY <br> please Help
geniusboy [140]

Answer:

A right circular cone

Step-by-step explanation:

7 0
3 years ago
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