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riadik2000 [5.3K]
4 years ago
6

Katie's living room is 12ft tall and 15ft wide. To decorate for a party, she plans to hang crepe paper around the perimeter of t

he ceiling and from each corner to the opposite corner. Katie can buy rolls that each contain 20 ft of crepe paper. What is the minimum number of rolls she should buy?
Mathematics
1 answer:
Yuliya22 [10]4 years ago
4 0
She should buy a minimum of 5 rolls
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7(2x-5)-11=3(5x-2)-2x
ICE Princess25 [194]

Answer:

x=40

Step-by-step explanation:

7(2x-5)-11=3(5x-2)-2x      Distribute

14x-35-11=15x-6-2x          Simplify

14x-46=13x-6                   subtract 13x and add 46

x=40

5 0
3 years ago
Please help me understand this
Keith_Richards [23]

Answer:

The missing LCM is 4 brainy isn't letting me write more.

Step-by-step explanation:

7 0
3 years ago
The ages of trees in a forest are normally distributed with a mean of 25 years and a standard deviation of 4. Approximately what
harkovskaia [24]

Answer:

78.88%

Step-by-step explanation:

We have been given that

\mu=25,\sigma=4,x_1=20,x_2=30

The z-score formula is given by

z-\text{score}=\frac{x-\mu}{\sigma}

For x_1=20

z_1=\frac{20-25}{4}\\\\z_1=-1.25

For x_2=30

z_2=\frac{30-25}{4}\\\\z_2=1.25

Now, we find the corresponding probability from the standard z score table.

For the z score -1.25, we have the probability 0.1056

For the z score 1.25, we have the probability 0.8944

Therefore, the percent of the trees that are between 20 and 30 years old is given by

0.8944 - 0.1056

= 0.7888

=78.88%

6 0
4 years ago
Read 2 more answers
Three consecutive even numbers have a sum where one half of the sum is between 84 and 96
mamaluj [8]

86 *2 = 172

172/3 = 57.33

54 + 56 +58 =168

168/2 =84


56 + 58 +60 = 174

174/2 =87

58 +60 +62 = 180

180/2 = 90

60 +62 +64 = 186

186/2 = 93


62 +64+66 = 192

192/2 = 96


 there are 3 sets of numbers that fall between 84 & 96

 1 set equals 84 and 1 set equals 96

 so if you are counting those there are 5 sets

 

6 0
3 years ago
1. -3x=21<br> 2. 13x=6<br> 3. -12x=-7<br> answer the equation for points and brainiest.
andre [41]

Answer:

1. x = -7

2. x = 6/13

3. x = 7/12

Step-by-step explanation:

1. x = 21 / -3

x = -7

2. 13x = 6

x = 6 / 13

x = 6/13

3. -12x = -7

x = -7 / -12

x = 7/12

<em>Hope that helps!</em>

3 0
3 years ago
Read 2 more answers
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