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GuDViN [60]
3 years ago
13

13. A square based cuboid has a width of 4cm. If the volume of the cuboid is 400 cubic

Mathematics
1 answer:
dsp733 years ago
4 0

Answer:

216 cm²

Step-by-step explanation:

Applying,

V = lwh..................... Equation 1

Where V = volume of the cubiod, l = length of the base, width of the base, h = heigth of the cubiod.

From the question,

Since the base of the cubiod is squared,

Therefore,

w = l = 4 cm, V = 400 cm³

Substitute these values into equation 1

400 = 4×4×h

h = 400/(4×4)

h = 25 cm

A = lw+lh+wh.................. Equation 1

Where A = surface area of the cuboid.

Given: l = 4 cm. w = 4 cm, h = 25 cm

Substitute these values into equation 1

A = (4×4)+(4×25)+(4×25)

A = 16+100+100

A = 216 cm²

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9. The results of a random survey is displayed in the histogram as shown.
natali 33 [55]

The number of people in the sample survey is 75.

Survey sampling, as used in statistics, is the process of choosing a sample of constituents from a target population to perform a survey. The word "survey" can be used to describe a wide range of observational methods or procedures. Most frequently, a questionnaire meant to assess people's traits and/or opinions is employed in survey sampling. The topic of survey data collecting involves various methods of contacting sample participants after they have been chosen. Sampling is done to cut down on the expense and/or labor required to survey the complete target population. A census is a survey that includes all members of the target population. A sample is a subset or segment of a population from which data will be drawn.

The sample survey has

5 people in 1-4 miles per week

10 people in 5-8 miles per week

15 people in 9-12 miles per week

20 people in 13-15 miles per week

25 people in 16-19 miles per week

The number of people in the sample survey is

5 + 10 + 15 + 20 + 25

=5(1 + 2 + 3 + 4 + 5)

=5(15)

=75

Hence, the number of people in the sample survey is 75.

Learn more about sampling survey here-

brainly.com/question/24564273

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7 0
2 years ago
The water level in a tank decreased 8 inches in 4 minutes. The tank drains at a steady rate. What is the change in the water lev
aalyn [17]
2 inches per minute 8÷4=2
3 0
3 years ago
Hewp..Pls
timofeeve [1]

Answer:

2y+4x=12

2*1+4*8=12

2+32=12

35=12

7 0
3 years ago
work out an estimate for the number of boxes of grass seed Helen needs.to find your estimate, round each of the numbers in your
Dima020 [189]

Answer:

A circle is a bounded object with points from its center to its circumference is equidistant.

Area of a circle = πr²

Where :

π = pi = 3.14

R = radius = diameter / 2 = 20m / 2 = 10m

3.14 x 10² = 314m²

Number of boxes needed to cover the garden = area of the garden / coverage of one box

314m² / 58m² = 5.14

5 boxes to one significant figure

<h2>Brainliest pls</h2>

3 0
2 years ago
6 ( y + 8 ) = 3 ( 2y - 7 )
tester [92]
There is no solutions.
      
6 ( y + 8 ) = 3 ( 2y - 7 )
6y + 48 = 6y - 21
      -48         -48
    6y = 6y - 27
    +27      +27
    33y÷33 = 6y÷33
          y=2/11 or 0.18

Hope this helps!
7 0
3 years ago
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