1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
KonstantinChe [14]
3 years ago
10

You are laying a concrete border around a circular pond ...The pond is 7 meters in diameter and is surrounded by a path 2 metres

wide . The concrete needs to be 50 mm deep .. You are using premixed bagged concrete . 1 cubic metre requires 106 x 20 kg bags . How many 20kg bags of premixed concrete do you need
Mathematics
1 answer:
nasty-shy [4]3 years ago
5 0

Answer:

300 bags of 20 kg  of premixed are required.

Step-by-step explanation:

Given:

diameter of pond 'd'= 7 m (given)

radius of inner border of pond 'r'= d/2= 7/2 m

The radius of outer circular border 'R'= r+2= 7/2+2= 11/2m

Area of concrete border around the circular pond= area of outer circle- area of inner circle

So, \pi\times R^2-\pi\times r^2= \pi\times (R^2-r^2)

=> 22/7 x ((11/2)²-(7/2)²)

=> 22/7 x (121/4-49/4)

=>\frac{22}{7} \times \frac{72}{4}

=> 56.57 m²

volume of concrete needed= area x height= 56.57 x 0.05= 2.8285 cubic meter

Since 1 cube meter requires 106 x 20 kg bags,

2.8285 cubic meters require bags= 2.8285x106x20 kg

20 kg bags of premixed concrete required= 2.8285x106x20/20

=> 2.8285x106

=> 299.821 or 300 approximately

You might be interested in
There's six questions. WILL AWARD BRAINLIEST!!!!
lina2011 [118]

Answer:

Question 1: 4

Question 2: 16

Question 3: 34

Question 4: 46

Question 5: Subtraction

Question 6: Multiplication

Step-by-step explanation:

8 0
3 years ago
If g(x)=f(x+k), what is the value of k?
lianna [129]
G(x) is f(x) shifted left by (4 -(-2)) = 6 units.

The value of k is 6.
6 0
3 years ago
Read 2 more answers
20 POINTS / WILL GIVE BRAINLIEST
padilas [110]

Answer: Total Volume =  15π + 18 π= 33π cubic mm

Step-by-step explanation:

What is the volume of the composite figure? Leave the answer in terms of π.

_33π mm3

We have a cone here conjoined to a semi-sphere.

so

Cone volume:  C = (1/3)*(πr^2) * h

semi-sphere volume :  V = (1/2)* (4/3) * (π * r^3)

r = 3 mm  and  h = 5mm

so   C = (1/3)*(π  (3)^2) * 5 =  15π  cubic mm

V = (1/2)* (4/3) * (π * 3^3) = 18 π cubic mm

Total Volume =  15π + 18 π= 33π cubic mm

3 0
3 years ago
3) Veronica traveled 126 miles on 3 gallons of gas. On another trip she traveled 210 miles on 5 gallons of gas. Find the unit ra
Goshia [24]
The answer is 42 mpg, all you need to do is divide 126/3 or 210/5 and they both equal 42.
8 0
3 years ago
PLEASE HELP? The standard form for the function is: P(x)=-5x^+120x-315.
dusya [7]

Answer:

P(x) = -5(x² - 12)² + 405

Step-by-step explanation:

P(x) = -5x² + 120x - 315

Factor out -5 from the first two terms

P(x) = -5(x² - 24x) - 315

Complete the square

P(x) = -5(x - 12)² - (-5(-12)²) -315

P(x) = -5(x - 12)² + 720 - 315

P(x) = -5(x - 12)² + 405

8 0
3 years ago
Other questions:
  • What is 2/3(6e+9f-21g)
    8·1 answer
  • A Ferris wheel has a radius of 48 feet. What is the distance a passenger will travel one time around the Ferris wheel?______ fee
    6·1 answer
  • The temperature in your town is 43°F. The radio announcer says that the temperature will drop 15 degrees. Write an expression to
    5·1 answer
  • The sum of two numbers is 190. The sum of their digits is 10.
    15·1 answer
  • Four and one-half minus three and five-eighths
    12·1 answer
  • Help anyone please??
    12·1 answer
  • PLEASE ANSWER THIS IN 30 MINUTES ILL GIVE YOU 30
    7·1 answer
  • I need help with problem 16
    5·2 answers
  • The two rectangles below are similar. What is the measurement of the missing side of the rectangle?
    11·1 answer
  • Calculate how many days there in 32 weeks​
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!