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mezya [45]
3 years ago
14

Can anyone help? I’m confused:(

Mathematics
2 answers:
lilavasa [31]3 years ago
8 0

Answer:

The answer is -1.

Step-by-step explanation:

( 1 + 3 ) - 6 / 2

(4) - 6 / 2

-2 / 2

-1

love history [14]3 years ago
8 0
The answer is -1. Due to PEMDAS, you have to do whatever is inside the parentheses first. When you replace “a” and “b” in the parentheses, it will give you 1+3 which is 4. After this, you have to do 4-6 in order to get -2. Then, you have to replace 2 in the denominator. By this point, it would be -2/2, which simplified to -1.
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In 1-5, given: Two similar cylinders with heights of 8 and 5 respectively.
lana66690 [7]

Answer:

1. The ratio of their diameters is 8/5 = 8 : 5

2. The ratio of their surface area is (8/5)²

3. The ratio of their volume is (8/5)³

4.The area of the base of the larger cylinder is 128 cm²

Step-by-step explanation:

Given that the two cylinders are similar, we have;

Two cylinders are similar when the ratio of their heights is equal to the ratio of their radii

Therefore, we have;

1. The ratio of the height of the two cylinders = 8/5 = The radio of their radii = r₁/r₂

The ratio of their diameter = D₁/D₂ = 2·r₁/2·r₂ = r₁/r₂ = 8/5

The ratio of their diameters D₁/D₂ = 8/5 = 8 : 5

2. The surface area of the cylinders = 2·π·r·h + 2·π·r²

Therefore, we have;

(2·π·r₁·h₁ + 2·π·r₁²)/(2·π·r₂·h₂ + 2·π·r₂²) = (r₁·h₁ + r₁²)/(r₂·h₂ + r₂²)

h₁ = h₂ × 8/5

r₁ = r₂ × 8/5

= (8/5)²(r₂·h₂ + r₂²)/(r₂·h₂ + r₂²)  = (8/5)²

The ratio of their surface area = (8/5)²

3. The volume of the cylinder = π·r²·h

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The ratio of their volume = (8/5)³

4. The ratio of the area of the base of the larger cylinder to the area of the base of the smaller cylinder is (8/5)²

Therefore if the area of the base of the smaller cylinder is 50 cm², the area of the base of the larger cylinder = 50 cm² × (8/5)²  = 128 cm²

7 0
3 years ago
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Step-by-step explanation:

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I can’t, sir! I cannot leave my post to help with your math problems, over!

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