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Bess [88]
3 years ago
5

what is the area of the top surface of a cicular manhole cover that has a radius of 30 centimeters?use 3.14 for TT

Mathematics
1 answer:
Tcecarenko [31]3 years ago
6 0
11304 cm^2,     S.A=4*pi*r^2
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Please Help! Show all the steps!
likoan [24]

You can start by subtracting different equations from each other.

3x + 2y + 3z = 1

subtract

3x + 2y + z = 7

2z = -6

divide by 2

z = -3

add the following two expressions together:

3x + 2y + z = 7

3x + 2y + 3z =1

6x + 4y + 4z = 8

subtract the following two expressions:

6x + 4y + 4z = 8

5x + 5y + 4z = 3

x - y = 5

^multiply the whole equation above by 3

3x - 3y = 15

subtract the following two expressions:

3x - 3y = 15

3x + 2y = 10

-5y = 5

divide each side by -5

y=-1

take the following expression from earlier:

x - y = 5

substitute y value into above equation

x - - 1 = 5

2 negatives make a positive

x + 1 = 5

subtract 1 from each side

x = 4

Therefore x = 4, y = -1, z = -3

I checked these with all 3 equations and they worked :)

(it's quite complicated, comment if you don't understand anything) :)

7 0
3 years ago
Perpendicular line equation to y=3/5x+1
natulia [17]

Answer:

Find the negative reciprocal of the gradient, so 3 / 5 will switch its denominator with its numerator, and it will have the opposite sign.

So 3/5 will be - 5/3

Answer:

y = - 5 / 3x + 2

3 0
3 years ago
Whats 9+10???? i really need to know this
madreJ [45]

Answer:

19

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Is 7/8 or 11/10 closer to 1
Firlakuza [10]
10. Find which one of the given fractions are value closer to 1. First = 7/8 Second = 11/10 Let’s start solving Let us start with the first value which is 7/8 => 7 needs to be divided with 8 => 7 / 8 = 0.875 Now, let’s solve the second value which is 11/10 => same with first solution., divide 11 by 10 => 11 / 10 => 1.1 Thus, 11/10 is the has the nearest value to 1.
4 0
3 years ago
What is the oppostie of _12
vazorg [7]
The opposite of twelve is negative twelve.
3 0
3 years ago
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