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notka56 [123]
2 years ago
9

Please answer number 8. I need help, I don’t understand.

Mathematics
1 answer:
Bond [772]2 years ago
6 0

Answer:

A=2πrh+2πr2 this is the surface are formula of a cylinder. You already know the scale ratio is 2.5 so the answer is (2.5*surface area formula). For the formula just plug in the values for the radius and the height that is given and solve.

Step-by-step explanation:

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3(-2a-4)+3a what would this be i have so many questions today to ask y'all
Novay_Z [31]

Answer:

<h2>- 3(a + 4)</h2>

Solution,

3( - 2a - 4) + 3a \\  = 3 \times ( - 2a) - 3 \times 4 + 3a \\  =  - 6a - 12 + 3a \\  =  - 6a + 3a - 12 \\  =  - 3a - 12 \\  =  - 3(a + 4)

Hope this helps...

Good luck on your assignment...

8 0
3 years ago
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What's the answer I need help
Olegator [25]
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8 0
3 years ago
This design shows several circles with the same center. The total radius of the design is 8 inches. The angle shown has a measur
Burka [1]

Answer:

11.33 in.  to the nearest hundredth.

Step-by-step explanation:

The perimeter of the shaded area =   length of the 2 straight lines + the length of the 2 arcs = 4 + length of the 2 arcs.

Calculate the length of the outer arc:

This equals (30 / 360) * perimeter of the largest circle

= 1/12 * 2 π * 8

= 4/3 π in.

The inner circle has a radius of  8 - 2 = 6 ins

so the length of the inner arc

= 1/12 * π * 2 * 6

= π in.

So the perimeter of the shaded region = 4 + 4/3 π + π

= 4 + 7π/3

=  11.33 in.

7 0
2 years ago
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Evaluate the following.<br> (iii) sin 30° + tan 40° - cosec 60° / cot 45° + cos 60° - sec 30°​
bearhunter [10]

Sin 30 = 1/2

tan 45 = 1

Cosec 60 = 2 / √3 = 2√3 / 3

cot 45 = 1

Cos 60 = 1/2

sec 30 = 2 / √3 = 2√3 / 3

_______________________________

[ 1/2 + 1 - 2√3/3 ] ÷ [ 1 + 1/2 - 2√3/3 ] = <em>1</em>

The face and denominator of the fraction are exactly the same thus the answer is 1 .

4 0
3 years ago
Are these triangles congruent? If so, name the triangle congruence method.
mars1129 [50]

Answer:

The answer you chose is correct

Step-by-step explanation:

4 0
3 years ago
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