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Anika [276]
3 years ago
5

PLSSS HELP THANK YOUUUUUU

Mathematics
1 answer:
trasher [3.6K]3 years ago
5 0

Answer:

<em>First row:</em>

4:5     4/5      0.8     80%

<em>Second row:</em>

19:20    19/20     0.95    95%

<em>Third row:</em>

9:20     9/20     0.45    45%

<em>Fourth row:</em>

4:5     4/5     0.8     80% (same as first row)

Hey guys! I need help with this question urgently, so could you please help me out? Thanks in advance! Merry Christmas!

Question: brainly.com/question/19989741

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A cylindrical metal pipe has a diameter of 20 millimeters and a height of 21 millimeters. A cylindrical hole cut out of the cent
Nina [5.8K]
<h3>Answer:</h3>
  • 21π(10)^2 – 21π(6)^2
  • 2,100π – 756π
<h3>Step-by-step explanation:</h3>

The volume of metal is the difference of the overall volume of the cylinder and the volume of the hole in it. The formula for the volume of a cylinder is ...

... V = π·r^2·h . . . . . radius r and height h

For the overall dimensions, the radius is half the diameter, so is 10 mm. The hole is said to have a radius of 6 mm. The overall "height" is 21 mm, so the volume in mm³ will be ...

... V_overall -V_hole = π(10)^2(21) -π(6)^2(21)

... = 21π·10^2 -21π·6^2 . . . . . . . matches the first selection

... = 2100π -756π . . . . . . . . . . . matches the third selection

... = 1344π . . . . . . . . . . . . . . . . doesnt' match any selection

6 0
4 years ago
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. (06.03 LC) What is the coefficient of y in the expression 2 ⋅ 4 + 3y? (1 point) 2 3 7 8
masya89 [10]

Coefficient of y = 3

Solution:

Given expression is 2 · 4 + 3y.

To find the coefficient of y:

Coefficient means the number in front of the variable or term.

Here, the number in front of y is 3.

2 and 4 are not in front of y, they are separate term.

So, Coefficient of y = 3.

Hence the coefficient of y in the expression 2 · 4 + 3y is 3.

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3 years ago
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2929293939393939494. merry iwie i
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Determine if each statement is true or false. If the statement is false, explain why, or show work proving that it is false.
kherson [118]

Answer:

a). true

b). true

Step-by-step explanation:

a).

Given : If a = 5, then ac = 5c

            Let c be any constant.

            a = 5 (given)

            Therefore, ac = 5c

Here a  is given a constant value (5), also let assume c to be a constant. So when we multiply each term we will get a constant value of 5c. The ratio does not change.

Hence proved.

b).

Given : If ac = 5c, then a = 5

            Let c be any constant

            It is given, a = 5

Therefore, ac = 5c

Here the product of two terms is given as 5c, where c is assume to be a constant. Then as a product rule, the value of a will be 5. The ratio will not change.

Hence proved.

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