Number 11 please. Need help

Mathematics

1 answer:

Nataly [62]2 years ago

6 0

Answer:

11a. 3,117

11b. 33

Step-by-step explanation:

11a. -165 + 3217 + 65

The easiest way to do this would be,

-165 + 65 = -100 than -100 + 3217

-100 + 3217 is the same as 3217 - 100

-100 + 3217 = 3,117

11b. 173 + (-43) + (-97)

this is the same as 173 - 43 - 97

173 - 43 = 130 and 130 - 97 = 33

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Answer:

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Step-by-step explanation:

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Question content area top

Natali5045456 [20]

The circumference of the outer circle is greater than that of the inner circle by 18.86 feet.

<h3>What is Circle?</h3>

A circle is a round 2-dimensional shape. It is a closed shape with a distance from center to circumference termed as radius 'r' and distance from one point on the circumference to another point passing through center termed as diameter 'd'.

The circumference of the inner circle is 88 ft.

Circumference of a Circle = 2πr

2πr = 88

2 X 22/7 X r = 88

r = 88 X 7 / 44

r = 14 ft.

Radius of the inner circle = 14 feet

If the distance between the inner circle and the outer circle is 3 ft, the radius of the outer circle = 14+3 = 17 feet.

circumference of the outer Circle = 2πr

= 2 X 22/7 X 17

= 106.86 ft.

Difference in Circumference = 106.86 - 88 = 18.86 feet