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3 years ago

Please help I'm dying rn

Mathematics

2 answers:

amid [387]3 years ago

6 0

Answer:

-3√5

Step-by-step explanation:

3√5-2√45

3√5-2•√9×√5

3√5-2•3√5

3√5-6√5

-3√5

Greeley [361]3 years ago

5 0

Answer:

c. $- 3 \sqrt{5}$

Step-by-step explanation:

$3 \sqrt{5} - 2 \sqrt{45}$

$- 2 \times 3 \sqrt{5} = - 6 \sqrt{5}$

$3 \sqrt{5} - 6 \sqrt{5}$

$(3 - 6) \sqrt{5} = - 3 \sqrt{5}$

$\boxed{\green{= - 3 \sqrt{5} }}$

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Ronch [10]

Answer:

<em><u>1 and 5</u></em>

Step-by-step explanation:

The squares have a side length of 10 and 1 square side is the radius of the half-circles. Since there are two half-circles, find the circumference for one full circle:

$C=2\pi r$

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$r=10\\C=2\pi *10$

Simplify pi:

$C=2*3.14*10$

Simplify multiplication:

$C=6.28*10\\C=62.8$

The circumference of the circles is 62.8. Now find the perimeter of the exposed squares with side length 10. There are 4 exposed sides, which equals one square. Find the perimeter:

$P=10+10+10+10\\P=10+10+20\\P=10+30\\P=40$