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vampirchik [111]
3 years ago
8

A theater has 20 rows of seats. If there are 4 seats in the 1st row 12 in the 2nd row, 20 in the 3rd row . How many seats are th

ere in total? Show and explain all work.
Mathematics
2 answers:
anzhelika [568]3 years ago
6 0

Answer:

164 seats

Step-by-step explanation:

you make the equation 4+ 8X to deteremine the seats and x equals the rows and you get your answer.

qwelly [4]3 years ago
6 0

Answer:

156 seats

Step-by-step explanation:

since you are adding 8 seats for each row you go up on, it will be 28 for the 4th row, 36 for the 5th, 44 for the 6th, 52 for the 7th, 60 for the 8th, 68 for the 9th, 76 for the 10th, 84 for the 11th, 92 for the 12th, 100 for the 13th, 108 for the 14th, 116 for the 15th, 124 for the 16th, 132 for the 17th, 140 for the 18th, 148 for the 19th, and 156 for the 20th.

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A square is folded into half to form a rectangle. the perimeter of the rectangle is 36cm. calculate the area of a square​
zhannawk [14.2K]

Answer:

Let the measure of each side of the square be " x " cm.

then ,

area of square = x²

After we folded the square into a rectangle ,

length of rectangle = x

breadth of rectangle = x/2

perimeter of rectangle = 36 cm

x +  \frac{x}{2}  + x +  \frac{x}{2}  = 36 \\  \\    \frac{2x + x + 2x + x}{2}  = 36 \\  \\   \frac{6x}{2}  = 36 \\  \\ 6x = 36 \times 2 \\  \\ 6x = 72 \\  \\ 6x =  \cancel{\frac{72}{6} } = 12cm

hence ,

side of square = 12 cm

therefore ,

area of square = 12 × 12 = 144 cm²

hope helpful~

8 0
2 years ago
The ratio of people who walk home from school to people who ride the bus home is 2 : 7 2 : 7 . The number of bus riders is how m
SashulF [63]
Ratio walkers to riders 2:7

7/2=3.5

The bus riders are 3.5 times more than the riders
8 0
3 years ago
If the legs of an isosceles right triangle have a length of 15 StartRoot 2 EndRoot ft, what is the length of the hypotenuse?
lorasvet [3.4K]

Answer:

30 ft

Step-by-step explanation:

a² + b² = c²

(15sqrt(2))² + (15sqrt(2))² = c²

225 * 2 + 225 * 2 = c²

c² = 900

c = sqrt(900)

c = 30

Answer: 30 ft

4 0
3 years ago
Read 2 more answers
Triangles and algebra
Elanso [62]

Hello from MrBillDoesMath!

Answer:

x = 10


Discussion:

A plane triangle contains 180 degrees. Adding the angles in the triangle shown in  #8 gives

(4x + 7) + (3x + 13) + 90 = 180


Note the "right angle" shown in the triangle has been replaced by its 90 degree equivalent in the above equation.

Combining like terms gives


( 4x + 3x) + (7 + 13) + 90 = 180

7x + 20 + 90 = 180 =>                      (subtract 90 from each side)

7x + 20 + 90 - 90 = 180 - 90 = 90  =>

7x +20 = 90  =>                                (subtract 20 from each side)

7x + 20 -20 = 90 -20 =>

7x = 70 =>

x 70/7 =10.



Thank you,

MrB

3 0
3 years ago
Help 15 points!!<br> I’m dumb but I need this answer fast! <br><br> Subtract -5/18 - (-1/4)
Ganezh [65]

Answer:

The Answer is =  -1/36

Step-by-step explanation:

First of all we will evaluate the signs

-5/18 -(-1/4)

-5/18+ 1/4      (As negative into negative gives = positive)

then we will take LCM

LCM OF 18 AND 4 WILL BE = 36

-10+ 9/ 36

-1/36

5 0
3 years ago
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