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Len [333]
3 years ago
14

What two two digit numbers that when added together equal 30 and when subtracted equals 4 or -4? Please respond quickly and with

work and I will mark best answer as the brainliest answer!
Mathematics
1 answer:
Kazeer [188]3 years ago
7 0

Answer:

The two digit numbers are 13 and 17.

Step-by-step explanation:

Firstly, you have to form a simultaneous equation. The information is when 2 number are added equals to 30 and when substracted is equals to 4 or -4. Let variable to represents the number :

Let x be 1st number,

Let y be 2nd number,

x + y = 30 -  -  -  - (1)

x - y = 4 -  -  -  - (2)

Then you have to solve these simultaneous equation :

(1) - (2)

x - x + y - ( - y) = 30 - 4

y + y = 26

2y = 26

y = 13

Substitute y = 13 into (2),

x - 13 = 4

x - 13 + 13 = 4 + 13

x = 17

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Find the lateral surface area of the cylinder. Round your answer to the nearest tenth.
GuDViN [60]

Answer:

113.1 unit²

Step-by-step explanation:

A cylinder is a shape with two round ends and two parallel lines connecting the round ends.

Height=9  unit, Base=4 unit

The lateral surface area of a cylinder (A) is given by the equation:

A=2\pi rh

where r is the radius of the cylinder and h is the height of the cylinder.

Given that the base = 4 unit, therefore the diameter (d) = base = 4 unit. Also the height (h) = 9 unit.

Radius (r) = d/2 = 4/2 = 2 unit

Calculating the area of the cylinder is as follows

A=2\pi rh\\A=2\pi*2*9\\A=113.1

The area of the cylinder is 113.1 unit²

8 0
3 years ago
X+4y=30 system by substitution <br><br> X-2y=0
Dmitry [639]

Answer:

x=10, y=5

Step-by-step explanation:

For substitution, you always want to get the variable alone. The second equation (x-2y=0) will be easier to substitute into the first equation.

x-2y=0

x=2y

You can substitute 2y as x on the first equation (x+4y=30).

2y+4y=30

6y=30

y=5

Plug y=5 into any equation.

x+4(5)=30

x+20=30

x=10

3 0
3 years ago
Please help me with this and pls don't answer if you don't know it.
Brrunno [24]

Answer:

See below.

Step-by-step explanation:

The 3 marked angles add up to 360 degrees.

5x + 12 + 10x - 37 + 9x + 1 = 360

24x - 24 = 360

24x = 384

x = 384/24 =  16

The large angle at C = 10(16) - 37

= 160 - 37 = 123 degrees.

So m <BCA = 180 - 123

=  57  degrees    (adjacent angles add up to 180).

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Answer:

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Answer:

12:6

Step-by-step explanation:

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7 0
3 years ago
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