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aivan3 [116]
3 years ago
9

A new sidewalk will be 5 feet wide, 240 feet long, and filled to a depth of 9 inches (0.75) with concrete. How many cubic yards

of concrete are needed?
Mathematics
1 answer:
RSB [31]3 years ago
6 0

In order to build the sidewalk, they would need around 33  yrds^3 of concrete. This is because the problem is asking for the volume of the sidewalk. First, we need to convert everything into yards. The final answers we would get would be (5/3) (80) and (0.25). If we were to use the formula for volume, it would be V=lwh. With that incorporated, the answer would be 33.3333333 yrds^3 of concrete to be exact.

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The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000
mel-nik [20]

Answer:

0.018 is the required probability.              

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 60,000 miles

Standard Deviation, σ = 1500 miles

We are given that the distribution of tread life is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

P(brand will last between 56,850 miles and 57,300 miles)

P(56850 \leq x \leq 57300) = P(\displaystyle\frac{56850 - 60000}{1500} \leq z \leq \displaystyle\frac{57300-60000}{1500}) = P(-2.1 \leq z \leq -1.8)\\\\= P(z \leq -1.8) - P(z < -2.1)\\= 0.0359 - 0.0179 = 0.018= 1.8\%

P(56850 \leq x \leq 57300) = 1.8\%

0.018 is the probability a certain tire of this brand will last between 56,850 miles and 57,300 miles.

7 0
3 years ago
Grapes cost $1.99 per pound. write an expression for the cost of g pounds of grapes.
Zanzabum

Because the unit rate for a pound of grapes is 1.99, the expression would be:

1.99g

8 0
4 years ago
Find the area of the triangle with A= 60° b=11 feet and c=8 feet
Rudik [331]

Answer:

5280

Step-by-step explanation:

if u times them all up first u get 60 times 11 witch = 660 and then i times 660 and 8 to get 5280

5 0
3 years ago
A computer and printer cost total of $927 the cost of the computer is two times the cost of the planet find the cost of each ite
swat32

The cost of the printer is $309 and cost of the computer is $618.

Step-by-step explanation:

Let x denote the cost of computer

Let y denote the cost of printer

Total cost of printer and computer OR

x + y = $927

<u>To find the cost of x and y,</u>

Cost of computer = 2 x cost of the planet

x = 2y

x+y = 927

2y+y = 927

3y = 927

y = 309

x = 2y

x = 2(309)

x = 618

Therefore, the cost of the printer is $309 and cost of the computer is $618.

Keyword: Cost, Algebra

Learn more about cost at

  • brainly.com/question/5059091
  • brainly.com/question/5282516

#LearnwithBrainly

6 0
3 years ago
An exterminator must treat the perimeter of a house for insects. If the house is 90 feet long and 30 feet wide, what is the tota
Anika [276]
Perimeter = 2l + 2w
perimeter = 2(90) + 2(30)
perimeter= 180+60
perimeter= 240 ft
4 0
4 years ago
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